Mention one example each for aniamls with chitinous exoskeleton and those covered by a calcareous shell.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for one example of animals with a chitinous exoskeleton and one example of animals covered by a calcareous shell.

2. **Identifying Chitinous Exoskeleton**:
- Chitin is a tough, flexible material that forms the exoskeleton of certain animals, particularly arthropods.
- Common examples of animals with chitinous exoskeletons include insects and crustaceans.

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