Differentiate essential and non-essential amino acids.

Explanation

### Step-by-Step Solution

1. **Definition of Amino Acids**:
- Amino acids are organic compounds that serve as the building blocks of proteins. They link together through peptide bonds to form polypeptides and proteins.

2. **Classification of Amino Acids**:
- Amino acids can be classified into two main categories: essential amino acids and non-essential amino acids.

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