Give reasons: Respiration is called a catabolic process.

Explanation

**Step-by-Step Solution:**

1. **Definition of Respiration**: Respiration is a biochemical process that occurs in living organisms to convert food into energy.

2. **Understanding Catabolic Processes**: The term "catabolic" refers to metabolic pathways that break down large molecules into smaller ones. This process typically releases energy.

3. **Role of Glucose in Respiration**: In respiration, glucose, which is a large biomolecule, is the primary substrate that is broken down.

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