The devil fish and sea hare are

Options

A. Molluscs
B. Crustaceans
C. Coelenterates
D. Marine fish and mammal

Answer

To answer the question about the classification of the devil fish and sea hare, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Devil Fish**: The term "devil fish" commonly refers to the octopus. Octopuses are known for their intelligence and ability to camouflage.

2. **Identify the Sea Hare**: The sea hare is a type of marine mollusk belonging to the class Gastropoda. Its scientific name is Aplysia.

3. **Determine the Phylum**: Both the octopus (devil fish) and the sea hare belong to the phylum Mollusca. Mollusks are characterized by their soft bodies and, in many cases, a hard shell.

4. **Evaluate the Options**: The options given are:
- A) Mollusk
- B) Crustaceans
- C) Cnidarians
- D) Marine fish and mammals

5. **Analyze Other Options**:
- **Crustaceans**: This group includes animals like crabs and lobsters, which are not related to octopuses or sea hares.
- **Cnidarians**: This group includes organisms like jellyfish and sea anemones, which are also not related to the two mentioned.
- **Marine Fish and Mammals**: This category includes fish and marine mammals like dolphins, which do not include octopuses or sea hares.

6. **Select the Correct Answer**: Since both the devil fish (octopus) and sea hare belong to the phylum Mollusca, the correct answer is A) Mollusk.

### Final Answer:
The devil fish and sea hare are classified as **Mollusks**.

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