What are the essential and non-essential amino acids?Give two examples of each type.

Explanation

### Step-by-Step Solution:

1. **Definition of Amino Acids**:
- Amino acids are the building blocks of proteins. They consist of a central carbon atom (alpha carbon) bonded to four different groups: an amino group (-NH2), a carboxylic acid group (-COOH), a hydrogen atom (-H), and a variable side chain (R group) which determines the specific properties of each amino acid.

2. **Essential Amino Acids**:
- Essential amino acids are those that cannot be synthesized by the human body and must be obtained through diet. There are a total of 9 essential amino acids.
- **Examples**:
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