What are cilia and flagella?

Explanation

**Step-by-Step Solution:**

1. **Definition of Cilia and Flagella:**
- Cilia and flagella are both hair-like organelles found on the surface of certain cells.

2. **Structure:**
- Cilia are short and numerous, resembling tiny hairs on the cell surface.
- Flagella are longer and usually fewer in number, often appearing as a single or a pair of long tails.
...