Excretory product of mammals is generally

Options

A. Uric acid
B. Urea
C. Ammonia
D. All the above

Answer

**Step-by-Step Solution:**

1. **Understanding Excretory Products**: Excretory products are waste substances that are eliminated from the body. Different organisms have different primary excretory products based on their physiology and habitat.

2. **Analyzing Uric Acid**: Uric acid is one of the excretory products found in some animals. While mammals can excrete uric acid, it is typically done in minimal quantities. Therefore, it is not the primary excretory product for most mammals.

3. **Identifying Urea**: Urea is a nitrogenous waste product formed from the breakdown of proteins. In mammals, urea is produced in the liver through the urea cycle, which converts toxic ammonia into urea. This process is essential because ammonia is highly toxic and cannot be stored in the body.

4. **Considering Ammonia**: Ammonia is indeed produced in the body during protein metabolism. However, due to its toxicity and the large amount of water required for its excretion, it is not suitable for mammals, which do not have access to abundant water like aquatic animals. Instead, mammals convert ammonia into urea for safer excretion.

5. **Conclusion**: Based on the above analysis, the primary excretory product of mammals is urea. This is the most common and efficient way for mammals to eliminate nitrogenous waste.

**Final Answer**: The excretory product of mammals is generally urea.

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