Which animal shows pneumatophore: Hydra, sponges, Physalia or corals?

Explanation

To determine which animal shows pneumatophore among the options provided (Hydra, sponges, Physalia, or corals), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the term "pneumatophore":**
- Pneumatophores are specialized structures that help certain aquatic animals float. They are typically gas-filled bladders.

2. **Identify the options:**
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