Which one is least toxic out of these three: uric acid, urea and ammonia? Give 2 examples which excrete this product.

Explanation

### Step-by-Step Solution:

1. **Understanding Nitrogenous Wastes**:
- Nitrogenous wastes are byproducts of protein metabolism and are toxic to the body. They need to be eliminated to maintain homeostasis.

2. **Types of Nitrogenous Wastes**:
- The three main forms of nitrogenous wastes are:
- **Ammonia**: Highly toxic and water-soluble.
...