Mention the functions of cristae in mitochondria.

Explanation

### Step-by-Step Solution:

1. **Introduction to Mitochondria**:
- Mitochondria are known as the "powerhouses of the cell" because they are responsible for producing energy in the form of ATP (adenosine triphosphate).

2. **Structure of Mitochondria**:
- Mitochondria have two membranes: an outer membrane and an inner membrane. The inner membrane is highly folded, and these folds are called cristae.

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