Answer to Question #277704 in Zoology for Nelly

Question

Briefly explain how structure such as blastula and Gastrula differs between the following organisms human,amphibia ,Branchiostoma and Avian

Answer 1

The difference between blastula and gastrula is that these are two different stages of the same process. The blastula is formed right after fertilization, whereas the gastrula is formed after the blastula. The embryo at the time of blastulation is pre-mature. Whereas at the time of gastrulation, the embryo is matured.