Which of the following are considered more primitive based upon the structure of their limbs?
A) bats
B) reptiles
C) porpoises
D) penguins
E) birds

Question

Quizplus · Accepted Answer

Reptiles are considered more primitive based upon the structure of their limbs because they have limbs that stick out to the side which is similar to the way their ancestors' limbs were structured. This is in contrast to most other animals, including bats, porpoises, penguins, and birds, which have limbs that are positioned underneath their bodies, allowing for more efficient movement.

Which of the Following Are Considered More Primitive Based Upon