Define the following terms of giving examples.
Poikilotherms

Explanation

### Step-by-Step Text Solution:

1. **Definition of Poikilotherms**:
Poikilotherms are organisms that do not have a constant body temperature. Instead, their body temperature varies with the temperature of their environment. This means that their physiological processes are influenced by external temperature changes.

2. **Characteristics**:
- Poikilotherms are often referred to as "cold-blooded" animals.
- They rely on environmental heat sources to regulate their body temperature.
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