Differentiate between Erythrocytes and leucocytes of mammals

Explanation

### Step-by-Step Solution:

1. **Definition**:
- **Erythrocytes**: Commonly known as red blood cells (RBCs).
- **Leucocytes**: Commonly known as white blood cells (WBCs).

2. **Shape**:
- **Erythrocytes**: Bi-concave in shape.
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