`NH_(3)` is

Options

A. Less toxic
B. Toxic
C. Highly toxic
D. None

Answer

To solve the question "NH₃ is," we will analyze the properties and characteristics of ammonia (NH₃) in the context of excretion in organisms.

### Step-by-Step Solution:

1. **Identify NH₃**:
- NH₃ is the chemical formula for ammonia. It is a compound made up of one nitrogen atom and three hydrogen atoms.

2. **Understand its Role in Excretion**:
- Ammonia is one of the nitrogenous waste products that can be produced by organisms. It is primarily produced during the breakdown of proteins and nucleic acids.

3. **Toxicity of Ammonia**:
- Ammonia is highly toxic to living organisms. Due to its toxicity, it cannot be accumulated in the body and must be excreted quickly.

4. **Water Requirement for Ammonia**:
- Ammonia is highly soluble in water, which means it requires a large amount of water for its excretion. This is why it is predominantly excreted by aquatic organisms, which have access to ample water.

5. **Comparison with Other Nitrogenous Wastes**:
- Other forms of nitrogenous waste include urea and uric acid. Urea is less toxic than ammonia and requires less water for excretion, making it suitable for terrestrial organisms. Uric acid is even less toxic and is excreted by organisms that need to conserve water.

6. **Conclusion**:
- Based on the above points, we conclude that NH₃ (ammonia) is highly toxic and requires a large amount of water for its excretion.

### Final Answer:
NH₃ is highly toxic.