Although vertebrate animals all look very different, they share the same basic structure of their skeleton and muscles. Some bones and muscles have been altered through adaptation for specific tasks, but they share the same evolutionary and genetic roots. The following
image highlights the same major area of the vertebrate skeleton in three different vertebrate animals: an allgator, a chimpanzee, and a
horse. This highlighting contains the in all three animals.

The answers are
a. Skull
b. Pelvic girdle
C. Pectoral girdle
D. Rib cage