How many naturally occurring amino acids in proteins exist? How many of these are synthesised by the body ?

Explanation

To answer the question regarding naturally occurring amino acids in proteins and how many of these are synthesized by the body, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Identify the Total Number of Naturally Occurring Amino Acids:**
- There are a total of **20 naturally occurring amino acids** that are used in the synthesis of proteins.

2. **Differentiate Between Essential and Non-Essential Amino Acids:**
...