The development of two sets of teeth during the life time found in mammals is called_______ dentition.

Explanation

**Step-by-Step Solution:**

1. **Understanding Dentition in Mammals**:
- Mammals have a unique characteristic in their dental structure, which involves the development of teeth at different stages of life.

2. **Identifying the Types of Teeth**:
- Mammals typically develop two sets of teeth: the first set is known as "milk teeth" or "deciduous teeth," and the second set is known as "permanent teeth."

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