Name the two forms in which individuals belonging to the group Cnidaria exist.

Explanation

### Step-by-Step Solution:

1. **Identify the Group**: The question asks about individuals belonging to the group Cnidaria. This is a classification in the animal kingdom.

2. **Recognize the Forms**: Individuals in the Cnidaria group exist in two distinct forms.

3. **Name the Forms**: The two forms are:
- **Polyp Form**: This form is typically attached to a surface and has a cylindrical shape.
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