Choose your answer from:
(A). hairs.
(B). feathers.
(C). pores.
(D). scales.
Given those answer options, answer the question: Answer the following question given this paragraph: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. They include crocodiles, alligators, lizards, snakes, and turtles. The reptile class is one of the largest classes of vertebrates. It consists of all amniotes except birds and mammals. Reptiles have several adaptations for living on dry land that amphibians lack. For example, as shown in Figure below , the skin of most reptiles is covered with scales. The scales, which are made of very tough keratin , protect reptiles from injury and prevent them from losing water. Q: What protective substance covers the skin of most reptiles? A:
A:
(D).