Which of the following is not a correct match of animal and its habitat?

Options

A. Hydra vulgaris - Sea water
B. Hydra gangetica - Freshwater
C. Obelia - Sea water
D. Physalia - Sea water

Explanation

To determine which of the following is not a correct match of animal and its habitat, we will analyze each option provided in the question. The animals mentioned are Hydra vulgaris, Hydra gengitica, Obelia, and Physalia.

### Step-by-Step Solution:

1. **Identify the Animals and Their Habitats:**
- **Hydra vulgaris**: Typically found in freshwater environments.
- **Hydra gengitica**: Also a freshwater inhabitant.
- **Obelia**: A marine organism, typically found in seawater.
- **Physalia**: Commonly known as the Portuguese man o' war, it is also a marine organism.

2. **Analyze Each Match:**
- **Hydra vulgaris**: Should be matched with freshwater, but if it is matched with seawater, this would be incorrect.
- **Hydra gengitica**: Should also be matched with freshwater, similar to Hydra vulgaris.
- **Obelia**: Correctly matched with seawater.
- **Physalia**: Correctly matched with seawater.

3. **Identify the Incorrect Match:**
- Since both Hydra species are freshwater organisms, if either is matched with seawater, it would be incorrect. The transcript indicates that Hydra vulgaris is matched with seawater, which is incorrect.

4. **Conclusion:**
- The incorrect match is **Hydra vulgaris** being matched with seawater.

### Final Answer:
The animal that is not correctly matched with its habitat is **Hydra vulgaris** (it should be matched with freshwater, not seawater).

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