Question

In invertebrates, the body temperature varies according to external conditions. So they are called ______ animals.

Answer 1

Poikilothermic or cold-blooded animals:

1. Animals in which the body temperature keeps hanging with the external environment or surroundings are called poikilothermic or cold-blooded animals.
2. Generally all the invertebrates and the animals belonging to the lower classes in the vertebrates show this tendency.

Final answer: In invertebrates, the body temperature varies according to external conditions. So they are called poikilothermic or cold-blooded animals.