All amino acids have a similar structure. which component is responsible for the differences in the 20 amino acids

a: the carboxlyic acid

b: the r group

c: the central form

d: the amine group

The R group.

Explanation:

All amino acids have atleast one carboxylic acid group and an amine group.

segmentation=endoskeleton=backbone=coelom=tissues

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands