Q: What type of vertebrates control body temperature to just a limited extent from the outside by changing behavior?


Read this paragraph and choose the correct option from the provided answers:

Early vertebrates were ectothermic. Ectothermy means controlling body temperature to just a limited extent from the outside by changing behavior. For example, an ectotherm might stay in the shade to keep cool on a hot, sunny day. On a cold day, an ectotherm might bask in the sun to warm up, like the snake in Figure below . Almost all living fish, amphibians, and reptiles are ectothermic. They can raise or lower their body temperature by their behavior but not by very much. In cold weather, an ectotherm cools down. As its body temperature drops, its metabolism slows down and it becomes inactive.

 Choices:

- etheric

- endothermic

- mimetic

- ectothermic


A:
ectothermic