Embryology 101 - Lesson 1: Egg Discovery

Elizabeth Janning, Melissa Mracek, Sarah Paisley, and Melinda Vlieger Author

02/24/2021 Added

153 Plays

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The first lesson in series of four from the Embryology 101 Curriculum. Youth will discover the parts of an egg as well as learn the roles and responsibility required over the course of the incubation period.

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[00:00:00.503](lively music)
[00:00:08.290]Hello, and thank you for joining us
[00:00:10.740]on an exciting journey as we learn more about embryology
[00:00:14.380]through the Nebraska 4-H Embryology 101 program.
[00:00:18.740]This is the first of four lessons that will guide you
[00:00:21.700]through the development of embryos and chicken eggs.
[00:00:25.360]My name is Sarah Paisley and I am the Extension Educator
[00:00:28.450]for Garden and Morrill Counties.
[00:00:30.040]I am excited to be your host.
[00:00:31.730]As you start this virtual journey of embryo development.
[00:00:35.460]Today, I will be joined by Rachel Adam,
[00:00:37.840]who is the 4-H assistant for Fillmore County.
[00:00:41.840]Before we start digging into our lesson,
[00:00:45.000]I want each of you to get out a piece of paper.
[00:00:48.110]This could be a plain piece of paper or a page
[00:00:50.430]in your journal and a writing utensil.
[00:00:53.710]I am going to show you two pictures.
[00:00:56.120]They are the same thing, just at different angles.
[00:00:59.610]And I want you to write down any questions you have
[00:01:02.840]about these two pictures
[00:01:04.570]and I mean, any question.
[00:01:07.230]Examine carefully.
[00:01:09.580]You can even pause this video
[00:01:11.590]if you need to, while you write down your questions.
[00:01:14.710]I know that a smart cookie like yourself
[00:01:17.720]can come up with at least five questions,
[00:01:20.250]if not more, as you look at these pictures.
[00:01:24.450]Are you ready?
[00:01:25.922]Begin.
[00:02:28.480]Great job of coming up with some questions about these eggs.
[00:02:32.800]I definitely want you to keep this paper safe
[00:02:35.060]as we're going to need it in the future.
[00:02:39.140]Now that you have some ideas or questions about these eggs,
[00:02:44.420]it's time to get started with our lesson for today.
[00:02:47.710]Our lesson is called Egg Discovery.
[00:02:50.370]Our objectives today are going to be to
[00:02:52.770]explain what an embryo is,
[00:02:55.110]explain what is required for the care in incubation
[00:02:58.870]of the eggs,
[00:03:00.160]identify the parts of an egg
[00:03:02.610]and practice caring for eggs during the incubation process.
[00:03:09.280]It is my pleasure to now turn this over to Rachel
[00:03:13.010]so she can talk to you a little bit more about an embryo.
[00:03:19.920]Hello, Nebraska 4-H.
[00:03:21.520]I am Rachel Adam, 4-H assistant for Nebraska Extension.
[00:03:25.630]And today we're going to start a really fun
[00:03:28.580]4-H science project called embryology.
[00:03:34.890]You may be thinking, "What is an embryo?"
[00:03:38.720]This would be a good time to pause the video
[00:03:41.500]and answer yes or no on whether you think the images
[00:03:44.860]on the screen are embryos.
[00:03:49.680]Is a tree and embryo?
[00:03:53.100]Yes.
[00:03:53.933]A tree is an embryo.
[00:03:56.430]How about a desk?
[00:03:58.730]No.
[00:03:59.563]A desk isn't an embryo.
[00:04:01.280]An eraser?
[00:04:03.010]No.
[00:04:03.843]An eraser isn't an embryo either.
[00:04:06.160]What about you?
[00:04:07.940]Yes.
[00:04:08.773]You started as an embryo.
[00:04:11.970]The definition of an embryo is an embryo is something
[00:04:16.750]that is alive from the very beginning stages of life.
[00:04:22.300]We could study a cat, dog or frog with embryology
[00:04:26.980]but we will be studying chickens for our project.
[00:04:32.200]Earlier, I showed you a dozen eggs
[00:04:35.090]and this is one of our eggs from that dozen.
[00:04:38.500]And as you can see,
[00:04:39.560]this is a typical looking egg.
[00:04:42.730]For some of you,
[00:04:43.690]it may be the first time that you've seen a brown egg.
[00:04:47.470]But because most of you are actually probably
[00:04:50.210]pretty used to seeing just white eggs in the store,
[00:04:53.390]do you think that there will be any differences
[00:04:56.310]on the inside of this egg just because it's brown?
[00:05:01.100]Let's look and see.
[00:05:03.730]Here's our egg cracked open.
[00:05:05.790]What do you guys notice?
[00:05:07.340]Is there any differences compared to the white eggs
[00:05:10.060]that you see in the store?
[00:05:12.880]We have our shell remains like right here,
[00:05:16.810]and here's a closeup of our egg inside.
[00:05:19.850]Not a lot of differences, right?
[00:05:23.280]Right now I would actually like you to go retrieve
[00:05:26.560]two things if possible.
[00:05:28.480]First is going to be this worksheet
[00:05:30.600]that you see here called Parts of an Egg.
[00:05:33.740]It will be located in your journal
[00:05:35.700]if you were given one by your teacher.
[00:05:37.870]That will allow us to fill this out
[00:05:39.690]as we continue to cover the different parts of the egg.
[00:05:43.500]The other thing I would like you to do is go get permission
[00:05:46.910]to crack open an egg so that you can actually crack the egg
[00:05:52.000]and look at this along with me in the video.
[00:05:55.550]Remember to ask permission first,
[00:05:58.150]find a plate that you can crack it into or a bowl
[00:06:01.530]and bring that back so that we can continue to learn
[00:06:04.670]about the parts of the egg together.
[00:06:12.680]To get started on our worksheet,
[00:06:14.980]we are going to start with the top box
[00:06:18.700]that's slightly on the left-hand side.
[00:06:21.080]And that is pointing to an empty space
[00:06:25.130]that's right in the shell.
[00:06:27.700]Anybody have any idea what that might be
[00:06:30.880]or where it might be located?
[00:06:36.380]If you're pointing at this shell right here,
[00:06:40.590]you are correct.
[00:06:42.590]If you take a look inside that shell,
[00:06:44.960]we have a bubble down in there.
[00:06:47.960]That bubble is going to be our air cell.
[00:06:51.870]That air cell is vital in making sure that the embryo
[00:06:57.510]has oxygen to inflate its lungs
[00:07:02.350]at which point it starts to chirp
[00:07:05.710]and we can call it officially a chick.
[00:07:09.600]So we have this air cell.
[00:07:10.810]You can go ahead and poke yours and open it up
[00:07:15.320]and see what that feels like
[00:07:16.896]or what it doesn't feel like.
[00:07:20.270]If we work our way clockwise around the picture,
[00:07:24.610]our next one is going to be the shell.
[00:07:28.120]Now we know that the shell
[00:07:29.900]is actually this whole outer protective part,
[00:07:33.500]but what is it?
[00:07:35.270]What is it made of?
[00:07:37.360]That's a really good question because it's very important
[00:07:40.260]in protecting our growing embryo.
[00:07:42.980]This shell is actually made up of calcium
[00:07:46.190]produced by the mother hen.
[00:07:49.130]The calcium builds up side by side
[00:07:52.860]until it creates the shell.
[00:07:56.120]Now, this seems like it's a really thin layer of shell,
[00:07:58.860]but it actually takes almost 20 hours
[00:08:03.230]to develop just this part of the egg.
[00:08:06.070]The rest of the egg doesn't take very long
[00:08:08.510]compared to the buildup of calcium
[00:08:10.760]that it takes to create this.
[00:08:13.020]Now what's really interesting about the shell
[00:08:15.480]is that the shell actually has little spaces.
[00:08:19.300]Can you see those spaces with your naked eye?
[00:08:22.103]No.
[00:08:23.410]The shell has such small little pieces missing of calcium
[00:08:28.270]that you can't see it with your naked eye.
[00:08:30.500]Now, if you looked at it with a high powered microscope,
[00:08:33.080]you would be able to see them.
[00:08:35.080]What is the purpose of these holes in the shell?
[00:08:39.400]If you guessed for gas transportation,
[00:08:42.760]you are correct.
[00:08:44.090]It allows for gases that are built up inside of the embryo
[00:08:48.300]as it develops to escape and leave the egg,
[00:08:51.950]but it also lets good air, oxygen, back into the shell
[00:08:57.500]so that the embryo can continue to develop appropriately.
[00:09:02.530]While we're talking about the shell,
[00:09:04.280]we're actually gonna skip down to the next one
[00:09:07.820]that is on the outside of the egg,
[00:09:10.810]not the box on the inside of the egg,
[00:09:13.530]but the box on the outside.
[00:09:15.620]What we're gonna look at is this really thin stuff.
[00:09:18.210]Do you see this flopping around right here?
[00:09:21.330]Yeah.
[00:09:22.290]Take a look at that.
[00:09:23.450]I actually encourage you right now to pause your video,
[00:09:27.380]and I want you to look at and feel this part
[00:09:30.700]if you have an egg in front of you.
[00:09:36.050]So this part right here
[00:09:38.460]is actually called the shell membrane.
[00:09:41.240]So this membrane is very important
[00:09:43.680]because remember we just talked about the fact
[00:09:45.830]that the shell has little pieces of calcium missing,
[00:09:50.770]so there's holes and this membrane actually
[00:09:54.870]helps to make sure that nothing bad gets inside of the egg.
[00:09:59.250]It also keeps the embryo
[00:10:04.330]from sticking to the actual shell itself.
[00:10:08.480]Now the embryo can still stick to the membrane.
[00:10:13.060]So we're gonna talk about another important feature here
[00:10:16.330]in just a little bit.
[00:10:17.680]But you can see as you look at this shell
[00:10:20.450]that this entire shell membrane is all the way around.
[00:10:24.860]It is actually the shell membrane
[00:10:27.900]that is what's right here with our air cell
[00:10:31.000]because it doesn't attach directly to our egg shell.
[00:10:40.060]On our worksheet,
[00:10:41.050]we're gonna go back to the box that is inside of the egg.
[00:10:46.110]It is pointing or it is part of the white stuff
[00:10:49.700]that makes up the egg.
[00:10:51.150]And that is actually all of this stuff right here.
[00:10:56.360]And you can feel that.
[00:10:58.200]Now some of it is actually a little bit gooier,
[00:11:00.800]you can see that on my egg,
[00:11:02.820]it's kind of runnier.
[00:11:04.270]But this stuff right here, it's more gel like.
[00:11:07.510]Is there any difference between the gel versus the liquid?
[00:11:13.960]No, there's actually not.
[00:11:15.150]It's the same stuff.
[00:11:16.950]It's called the albumen.
[00:11:18.930]The only thing that is different
[00:11:20.600]is that some of this liquid stuff has escaped
[00:11:24.360]from the gel state.
[00:11:25.820]What we're going to find out is that the quality of the egg
[00:11:29.170]actually is dependent upon how much of this liquid
[00:11:33.180]versus gel you have.
[00:11:35.110]The more gel you have, the better quality the egg is.
[00:11:39.400]You can actually, if we take a look at the egg
[00:11:42.180]from this perspective,
[00:11:43.970]you can see how much that gel has set up
[00:11:47.000]and I'm sorry for the glare, my lights aren't that great.
[00:11:49.420]But what we're gonna see is that that gel
[00:11:51.270]is really set up high and the higher that that sets up,
[00:11:54.710]the higher quality of an egg, it is.
[00:11:57.420]Okay.
[00:11:58.253]The next one on our list as we continue to go clockwise
[00:12:01.930]around our picture
[00:12:03.400]is pointing to a yellowish thing, a light yellowish thing
[00:12:09.600]but it is actually not really colored,
[00:12:14.070]it is clear.
[00:12:15.780]Now, if we take a very good close look at this yellow thing
[00:12:19.240]right here that we're going to talk about here
[00:12:20.790]in a little bit,
[00:12:22.140]it actually has a covering to it,
[00:12:24.490]a very specific covering.
[00:12:26.500]That is what we call the vitelline membrane.
[00:12:30.090]Now you can kinda see how it's glaring off
[00:12:32.960]of the yellow part there,
[00:12:35.560]but we actually can maybe see it a little bit more,
[00:12:38.720]especially on the side over here,
[00:12:44.210]we are gonna see that this is the vitelline membrane.
[00:12:48.750]The vitelline membrane actually encases the yellow stuff
[00:12:52.940]that's in here and we're gonna...
[00:12:55.340]I'll skip ahead.
[00:12:56.173]That's a yolk.
[00:12:57.520]So it actually encases the yolk
[00:12:59.710]and keeps all of that liquid yellow stuff together.
[00:13:04.670]If we didn't have the vitelline membrane,
[00:13:06.880]that would actually be all runny and flowing everywhere.
[00:13:10.440]So don't poke too hard
[00:13:12.450]because you'll open up that vitelline membrane
[00:13:15.497]and that won't be good.
[00:13:16.870]But you can actually feel it if you kinda
[00:13:20.020]just rub your finger over the top.
[00:13:21.520]Some of that is albumen
[00:13:22.610]because that is the purpose of the albumen,
[00:13:24.430]is to be gel and to keep everything lubricated.
[00:13:29.158]But some of that is the actual vitelline membrane.
[00:13:34.030]Now at the end of the vitelline membrane,
[00:13:36.890]we have a very important structure right there.
[00:13:42.450]So on our worksheet,
[00:13:43.740]that is actually going to be the next one on our list.
[00:13:49.180]That one is a little bit more difficult to see
[00:13:51.870]but it is the chalazae.
[00:13:53.590]And if you look down in your word bank down at the bottom,
[00:13:56.370]it's spelled C-H-A-L-A-Z-A-E.
[00:14:00.520]That's a chalazae.
[00:14:01.720]The chalazae is actually going to be the ends
[00:14:05.340]of the vitelline membrane that are twist together.
[00:14:08.270]And if we actually were able to open up an egg,
[00:14:11.490]cut and egg in half and see it,
[00:14:13.300]you would see that those would actually come down
[00:14:16.940]to the shell and attach.
[00:14:19.150]That actually helps the yolk from twisting around
[00:14:24.300]and getting banged up on the sides of the egg
[00:14:27.520]any time that you move that egg around.
[00:14:31.410]So it would come down to your shell
[00:14:34.160]and it actually just supports it,
[00:14:36.400]keeps that yolk from moving around
[00:14:38.100]because like we said, the vitelline membrane
[00:14:40.490]is very delicate, easy to break
[00:14:42.980]and if we didn't have that chalazae there
[00:14:45.240]to hold it still,
[00:14:46.430]our embryo would actually be bouncing around
[00:14:48.810]in the egg all the time as we turned it
[00:14:50.660]and moved it and all that kind of stuff.
[00:14:52.386]So we've got to keep that very stable,
[00:14:55.810]and that is exactly what that chalazae does.
[00:14:59.860]So let's actually go back
[00:15:01.210]and talk about this big yellow thing right here.
[00:15:04.610]Of course, everybody seems to know about this one
[00:15:08.300]a lot of times
[00:15:09.640]because we talk about either white eggs or the whole egg.
[00:15:13.630]And if you're looking at the whole egg
[00:15:15.610]when you fry it or cook it,
[00:15:17.850]this yellow part really gives a little bit different texture
[00:15:22.860]and appearance to the egg if you're using it.
[00:15:26.430]So this is the yolk and the yolk
[00:15:29.500]is actually going to be runny
[00:15:31.950]if we were to pop up open that vitelline membrane
[00:15:35.410]and the yolk is going to be where our embryo
[00:15:39.420]gets all of its nutrients from.
[00:15:41.870]So our embryo has to have food as it develops.
[00:15:45.610]And this right here is just packed full of protein
[00:15:50.180]that it can actually use as it is developing.
[00:15:57.520]On our yolk or in our yolk is actually a very important part
[00:16:02.030]of the egg.
[00:16:03.340]And it is going to be a little, tiny white dot.
[00:16:07.550]So if you look at this one,
[00:16:10.420]my dot is right there.
[00:16:13.370]Some eggs have a little bit better of a dot,
[00:16:16.790]it's a little bit clearer to see than this one is.
[00:16:20.220]It's gonna definitely be more round
[00:16:22.570]in appearance than this one.
[00:16:24.450]But what we see is that there's a big importance
[00:16:29.590]to that round dot.
[00:16:30.910]Anybody have any ideas what that might be?
[00:16:37.070]This white spot is what we call the germ spot.
[00:16:41.310]And the germ spot is actually where the embryo
[00:16:45.600]is going to start developing.
[00:16:47.610]So this is an important spot
[00:16:49.000]because this is where the sperm would actually meet the egg.
[00:16:53.180]And this is the exact spot that your embryo
[00:16:56.120]would start to become fertilized
[00:16:58.150]and start developing if it meets the right conditions
[00:17:01.210]outside of the egg.
[00:17:02.460]So we're going to see that this is the spot
[00:17:05.200]where the sperm actually meets.
[00:17:07.610]If the egg is fertilized, it will have a ring around it.
[00:17:12.410]Sometimes it's a reddish pinkish color,
[00:17:15.420]and you can tell on mine that mine is definitely
[00:17:18.440]not fertilized.
[00:17:20.120]My egg actually comes from a flock of chickens
[00:17:24.300]that do not have any roosters.
[00:17:28.180]Look and see if you can find your germ spot on your egg.
[00:17:33.840]Now is the time since we have gone through all of our boxes,
[00:17:38.190]you can actually take your egg and really feel it.
[00:17:41.970]See if you can feel that chalazae,
[00:17:44.010]if you can feel how thick that is.
[00:17:48.570]You can try to pick up your yolk and turn it.
[00:17:52.410]If you didn't find your germ spot,
[00:17:54.220]now would be a time where
[00:17:55.150]you could actually pick up your yolk
[00:17:56.910]and try to find where that germ spot is located.
[00:18:01.820]We can definitely feel the vitelline membrane now
[00:18:05.650]because I've separated mine from the albumen.
[00:18:08.850]And you can just see there's lots of differences in there
[00:18:12.520]as we go through that, as we feel that that yolk.
[00:18:16.430]So now is the time where you can actually break open.
[00:18:21.730]Whoa,
[00:18:23.350]can you feel that vitelline membrane right there
[00:18:25.890]as you peel that off of there?
[00:18:27.500]And then you can see how runny that yolk actually gets
[00:18:31.080]because that is all liquid,
[00:18:35.460]liquid food for that embryo
[00:18:39.720]Right now, you should have your entire worksheet filled out.
[00:18:42.710]If you missed anything, please feel free to rewind
[00:18:45.540]and go back and catch anything that you may have missed.
[00:18:49.830]We are now going to turn it back over to Rachel,
[00:18:52.750]who's gonna talk a little bit about the difference
[00:18:54.640]between fertile and infertile and how we need to take care
[00:18:57.920]of those eggs in order to get them to hatch.
[00:19:02.870]I have a dozen eggs with me in this carton.
[00:19:07.410]How many is in a dozen?
[00:19:09.200]Let's count.
[00:19:10.720]One, two, three, four, five, six,
[00:19:14.290]seven, eight, nine,
[00:19:16.340]10, 11, and 12.
[00:19:18.726]There are 12 eggs in a dozen.
[00:19:21.930]Are the eggs that I have in this carton
[00:19:24.580]different than the ones you see in the grocery store?
[00:19:28.430]Yes, they are different.
[00:19:29.870]The eggs I brought came from a flock
[00:19:32.620]or with both a mother,
[00:19:36.020]which we call a hen and a father, which we call a rooster.
[00:19:40.200]This means the eggs are fertile.
[00:19:43.070]The eggs you see in the store
[00:19:44.750]come from a flock of chickens with just hens,
[00:19:48.100]meaning the eggs are infertile.
[00:19:51.220]So the eggs you get from the grocery store
[00:19:53.800]cannot grow into a chick.
[00:19:56.090]It takes a hen 24 to 26 hours to produce one egg
[00:20:02.770]and 21 days for the egg to grow into a chick
[00:20:06.030]that will hatch.
[00:20:08.240]Next, we are going to talk about the eggs needs to hatch.
[00:20:13.700]If I gave the eggs back to the hen to take care of them,
[00:20:17.970]what would she do?
[00:20:19.690]How would she care for them?
[00:20:21.870]This would be a great time to pause the video
[00:20:24.780]and write down on a piece of paper
[00:20:26.680]your thoughts about how you think the hen
[00:20:28.610]would take care of them.
[00:20:34.970]We know that we need to keep chicken eggs warm
[00:20:38.480]in order for them to hatch.
[00:20:41.400]How does the chicken keep them warm?
[00:20:43.550]She sits on them.
[00:20:45.260]Can we sit on the eggs?
[00:20:47.240]No, we'd break them.
[00:20:49.430]We will use the incubator,
[00:20:51.520]which is this white box to keep them warm.
[00:21:00.380]Do all eggs need to be warm?
[00:21:02.790]No.
[00:21:03.623]Reptile eggs actually like it cool.
[00:21:07.620]The incubator will keep the temperature
[00:21:10.230]at 100 degrees Fahrenheit
[00:21:13.450]or anywhere from 99 to 101 is acceptable for chicken eggs.
[00:21:20.890]The hen will also turn her eggs to give them exercise.
[00:21:25.340]She would reach down with her beak
[00:21:27.400]and use her feet to move the eggs around.
[00:21:30.700]Why do you think the eggs need to be turned?
[00:21:34.360]One reason is so the embryo or chick
[00:21:37.870]stays warm on all sides.
[00:21:40.890]The other reason is so the embryo doesn't grow
[00:21:44.180]attached to one side and develop wrong.
[00:21:48.040]If you were in the classroom,
[00:21:49.610]we would have, you turned the eggs three times a day
[00:21:53.040]to give them some exercise.
[00:21:55.450]I am going to use an egg turner that looks like this.
[00:22:01.620]An egg turner will gently rock the eggs
[00:22:05.640]back and forth and give the eggs exercise for me.
[00:22:12.874]We placed at eggs in the egg turner pointy side
[00:22:15.610]or skinny side down.
[00:22:18.540]Eggs also need moisture or humidity.
[00:22:22.440]Humidity is the moisture in the air.
[00:22:25.370]The hen provides humidity
[00:22:27.140]without even knowing she's doing it.
[00:22:30.220]Humidity comes from the moisture in the air,
[00:22:33.110]collecting on the hens feathers
[00:22:36.100]when she walks through the grass.
[00:22:39.100]So why do eggs need humidity?
[00:22:42.130]The shell membrane needs to stay moist to prevent bacteria
[00:22:46.080]from entering.
[00:22:50.831]If there is not enough humidity,
[00:22:52.800]the membranes could get tough
[00:22:54.740]and the chicks will have a hard time hatching
[00:22:57.060]from it's shell.
[00:22:59.440]Do you think the embryo or chick needs to have food, water
[00:23:04.140]and air for the next 21 days?
[00:23:07.050]Absolutely it does.
[00:23:10.461]Wow, Rachel, that's a lot of important information
[00:23:13.760]as to how we can care for our eggs
[00:23:16.530]as they are in the incubator.
[00:23:19.720]This picture right here is going to be something
[00:23:22.070]that we will continue to show you in the upcoming lessons.
[00:23:25.570]It's very important
[00:23:26.550]because it starts to show us how our embryo
[00:23:28.830]is going to be developing in the first seven days
[00:23:33.260]of being in the incubator alone.
[00:23:36.610]We're excited to continue to share these opportunities
[00:23:39.510]with you as we move through the embryo development phases
[00:23:44.450]all the way up until day 21,
[00:23:47.410]when our chicks will hopefully hatch.
[00:23:51.270]In the meantime,
[00:23:52.440]we hope that you have some awesome learning opportunities
[00:23:56.640]and some great projects that you'll be able to learn about.
[00:24:01.720]That actually brings me to my next thing.
[00:24:05.750]I want you to go back and pull out that paper
[00:24:08.790]that we had worked with at the beginning
[00:24:11.060]with a whole bunch of questions that you had
[00:24:13.330]about those eggs.
[00:24:15.660]Carefully look at that piece of paper.
[00:24:19.100]Did we answer any of your questions today?
[00:24:22.540]Did we create any more questions?
[00:24:25.900]Please record any of the answers
[00:24:28.450]that you found today underneath or next to your question
[00:24:32.580]and at the bottom add any questions that we may have added
[00:24:37.720]as we went through today.
[00:24:42.020]If you do end up adding any awesome projects,
[00:24:45.120]please share with us.
[00:24:46.780]If you post these on social media,
[00:24:48.720]make sure you use the #NE4HEGGS, E-G-G-S.
[00:24:54.510]We can't wait to see what you have for us.
[00:25:00.570]Thank you for joining us today on this first lesson
[00:25:03.800]of Embryology 101.
[00:25:05.610]We hope that you continue with the next lesson
[00:25:07.950]titled Inside the Shell
[00:25:09.920]as you continue this journey through embryo development.
[00:25:13.940]See you again next time on Embryology 101
[00:25:17.070]sponsored by Nebraska Extension.
[00:25:19.742](lively music)

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Embryology 101 - Lesson 1: Egg Discovery

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