What is metabolism?

Explanation

**Step-by-Step Solution:**

1. **Definition of Metabolism**: Metabolism refers to the total biochemical reactions that occur within an organism to maintain the living conditions of its cells. It involves the conversion of food and drink into energy.

2. **Importance of Energy**: Living organisms require energy to perform various functions and activities. Metabolism is essential for providing this energy.

3. **Biochemical Reactions**: Metabolism consists of two main types of biochemical reactions:
- **Catabolic Reactions**: These reactions break down complex molecules into simpler ones, releasing energy in the process.
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