Define nutrition.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Nutrition**: Nutrition can be defined as the process by which living organisms take in food and convert it into energy and other vital nutrients necessary for their growth and functioning.

2. **Importance of Nutrition**: Every living organism requires nutrients to perform various bodily functions and to grow. Nutrients are essential for maintaining health and supporting life processes.

3. **Types of Nutrition**:
- **Autotrophic Nutrition**: This is a mode of nutrition where organisms, such as plants and some bacteria, can synthesize their own food using simple inorganic substances (like water and carbon dioxide) in the presence of light and chlorophyll. These organisms are referred to as autotrophs.
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