Which of the following animals' embryos develop within a watery sac called an amnion?
A. Birds
B. Bony fish
C. Jawless vertebrates (lampreys)
D. Mammals
E. Amphibians
F. Reptiles
G. All of them.
A. Birds
B. Bony fish
C. Jawless vertebrates (lampreys)
D. Mammals
E. Amphibians
F. Reptiles
G. All of them.