The excretory material of bony fish is:

Options

A. Urea
B. Protein
C. Ammonia
D. Amino acids

Answer

**Step-by-Step Text Solution:**

1. **Understanding Excretory Products**: The excretory products in animals can be classified into three main types based on their nitrogenous waste: ammonia, urea, and uric acid.

2. **Identifying Bony Fish**: Bony fish are aquatic animals that have a skeleton made of bone. They live in water, which influences their method of excretion.

3. **Excretion in Aquatic Animals**: Aquatic animals, including bony fish, primarily excrete ammonia due to the abundance of water in their environment. Ammonia is highly soluble in water and can be easily diluted and eliminated.

4. **Conclusion**: Therefore, the primary excretory material of bony fish is ammonia.

**Final Answer**: The excretory material of bony fish is ammonia.

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