Embryology

Placenta through the process of diffusion

I think so.

blood

Using an ultrasound machine, a horse embryo starts out spherical and remains that way until after implantation at around 17 days. At around 25 days id id easy to see the embryo's heart beating.

Eventually, the conceptus becomes an embryo and then a fetus. A differentiation continues.

Baby koalas (joeys) are born after a gestation period of just 35 days. After birth, the tiny, blind, hairless, bean-sized koala embryo emerges and moves into its mother's pouch, purely by instinct. At this stage it weighs about half a gram. Once in the mother's pouch, it then latches onto a teat, which swells in its mouth, securing it firmly so it does not fall out of the pouch. The koala baby, called a joey, feeds only on mothers' milk for 6-7 months.

To make the transition from mothers' milk to eucalyptus leaves, at about 6-7 months the joey begins to feed on "pap", which is actually a special form of the mother's droppings through which she can pass onto her joey the micro organisms which allow for digestion of eucalyptus leaves. No other animal lives solely on gum leaves, and special proteins are needed to digest them. One of the reasons the koala has a backward-opening pouch is so that the joey can stick its head out and feed on this pap which comes from the mother's own digestive system.

When the joey grows too large to fit in its mother's pouch, it still feeds a bit on mother's milk, lying on her stomach to feed, and spending the rest of its time firmly attached to her back. It only leaves "home" when the next breeding season starts.

in her uterus

There is no food supply for seeds but there is a food supply for animals that eat seeds is called food seed supply.

No

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I am not sure if this is a correct answer to your question, because i am no expert on fowl, but I am not aware of birds ever having gill slits in there formation. Humans have slits that have been misconstrued to be gill slits but those are there to help with the formation of your neck and ears.

I imagine that the two cases are related, but, like I said, I am no expert on birds.

nevermind....i patched the egg with kleenex. It survived and it hatched last night....its name is Patches. =o) Small late incubation cracks can be mended with a piece of scotch tape. Just be sure to use the smallest piece of tape possible, as the shell of an egg needs to remain gas permeable for proper development. As a teacher, I used to remove a very small piece of shell and used a syringe to dye the chicks with a small amount of food coloring (with breeds like the Pekin) before they hatched. Students were always atounded to see green, red, pink and blue chicks emerge.

Before placental development the conceptus gets nutrition from uterine secretions. After placentation nutrition comes from the mare via the placenta.

i think it is because to see who is the survival one.

Yolk Sack for Reptiles

Young caterpillars develop in the egg, but there's also kind of an embryonal development from caterpillar to butterfly in the pupa.

Hyaline cartilage is the forerunner of long bones in the embryo.

If you only have hens then no it is not possible. You need a rooster with the hens to get an embryo.

what is the source of nourishment for developing fish embryos?

Membrane

The yolk supplies all the nutrients for the growing embryo.

The one that has shockproof in it for PLATO users

Reptiles were the first group whose eggs cushioned the embryo in fluid and protected it with membranes and a shell. This prevents eggs from drying out and allows them to be laid away from water.

you must have at least one strand of dinosaur DNA (your choice of dinosaur) and use an anti matter displacement regulator to transpose the chicken egg embryo into the dinosaur embryo. You must place the egg inside the machine, and put the dinosaur DNA strand into the matter transpoition holder, and turn on the machine. Once the machine is on, make sure to NOT turn of during the process, or oyu could start a chain reaction causing dinosaurs to take over the planet. (trust me, its not as fun as it sounds! :P) once the machine has finished, you will hear a dinging noise to your left, and the embryo will be complete. To hatch the egg, make sure your incubator is turned as hot as it can go, and wait approx. 6-12 years for the egg to hatch. Then you should be right where you wanna be :P

In the case of non-identical twins, the two embryos are from completely different eggs and are quite independent of each other and so there is no splitting into two embryos. These are the most common type of twins.

With identical twins, it is the zygote that divides into two embryos, so you wouldn't say that the embryo divides. This usually occurs between 3-8 days after fertilization and the embryos will have one placenta and two amniotic sacs.

Sometimes it will occur before this time and each will have a placenta and a sac. Less frequently, the zygote will split up until 13 days post-conception with the embryos sharing a single sac and placenta. Complications are more likely in this case. Rarely, the split will occur after this, resulting in conjoined, or Siamese, twins.

Gastrulation