What statements about the embryos are true? Check all that apply.

A. All four animals begin as fertilized eggs.

B. The salamander and the chicken do not have an umbilical cord.

C. Only the fish has ancestral gill slits.

D. All four have identical limb buds.

E. Only the chicken will develop a shell breaker.

It's A,B, and E

Explanation:

I just did it on USAtestprep.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.