Why is physalia called polymorphic animal.

Explanation

**Step-by-Step Solution:**

1. **Definition of Polymorphism**: The term "polymorphic" refers to an organism that exhibits more than one form or type of body structure. In the context of Physalia, it means that this organism has different body forms that serve various functions.

2. **Understanding Physalia**: Physalia, commonly known as the Portuguese man o' war, is a colonial organism made up of specialized structures called zoids. Each type of zoid has a specific role within the colony.

3. **Types of Zoids**:
- **Tentaculozoids**: These are specialized for capturing prey. They form the tentacles that help in food capture.
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