Name two basic types of zooids of coelenterates. Give their function.

Explanation

**Step-by-Step Solution:**

1. **Identify the Two Basic Types of Zooids in Coelenterates:**
- The two basic types of zooids in coelenterates are **Polyp** and **Medusa**.

2. **Describe the Polyp:**
- The polyp has a tubular body structure with a mouth at one end, which is surrounded by tentacles. The other end of the polyp is typically attached to a substrate via a pedal disc.

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