Ectothermic animals are also called

Options

A. poikilothermal
B. cold-blooded
C. both 1 and 2
D. isotermic

Answer

### Step-by-Step Solution:

1. **Understanding Ectothermic Animals**: Ectothermic animals are those that cannot internally regulate their body temperature. Instead, they depend on external environmental conditions to maintain their body temperature.

2. **Terminology**: Ectothermic animals are commonly referred to as "cold-blooded" animals. This term reflects their reliance on external temperatures to control their body heat.

3. **Alternative Term**: Another term used for ectothermic animals is "poikilothermic." This term also describes organisms that have variable body temperatures that fluctuate with the environment.

4. **Conclusion**: Therefore, ectothermic animals are also called "cold-blooded" and "poikilothermal." The correct answer to the question is that ectothermic animals are referred to by both terms.

### Final Answer:
Ectothermic animals are also called poikilothermal and cold-blooded.