Answer:
C) become warm-blooded animals as they develop.
Explanation:
Warm-blooded organisms can be described as organisms which can maintain their internal body temperature constant even when the temperature outside fluctuates. On the other hand, cold-blooded organisms can be described as organisms which cannot maintain their internal body temperatures constant.
Not all vertebrates are warm-blooded. Vertebrates, like crocodile, are cold-blooded and hence the statement C is not true. There are many reptiles, amphibians and fishes which are cold-blooded and cannot maintain their body temperatures.
