How are bacteria classified on basis of their shapes ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Bacterial Classification**: Bacteria can be classified based on various characteristics, one of the primary methods being their shape.

2. **Identifying the Main Shapes**: Bacteria are classified into five main groups based on their shapes:
- **Cocci**: These are spherical-shaped bacteria.
- **Bacilli**: These are rod-shaped bacteria.
- **Spirilla**: These are spiral-shaped bacteria.
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