a. amnion
, b. shell
, c. yolk sac
The amniotic egg is an air-breathing egg with extraembryonic membranes and a shell. During development, they encased the amniote embryo in a private pond and facilitated gas exchange with the outside world. Amniotic eggs were an important adaptation for land-dwelling species, such as reptiles, birds, and even some mammals.
Consider the given diagram.
a. is amnion
b. is shell
c. is a yolk sac
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