Bony fishes are

Options

A. ammonotelic
B. ureotelic
C. uricotelic
D. both (2) and (3)

Answer

**Step-by-Step Solution:**

1. **Understanding Nitrogen Excretion**: The metabolism of proteins and nucleic acids produces nitrogen in the form of ammonia. Ammonia is highly toxic and must be eliminated from the body quickly to prevent toxicity.

2. **Types of Nitrogen Excretion**:
- **Ammonotelism**: Direct excretion of ammonia. This is common in aquatic animals where water is abundant.
- **Ureotelism**: Conversion of ammonia into urea, which is less toxic and requires less water for excretion. This is typical in terrestrial animals.
- **Uricotelism**: Conversion of ammonia into uric acid, which is even less toxic and conserves water. This is also common in terrestrial animals.

3. **Bony Fishes' Environment**: Bony fishes are aquatic organisms. In their environment, water is plentiful, allowing them to excrete ammonia directly without the need for conversion to urea or uric acid.

4. **Conclusion**: Since bony fishes live in water and can excrete ammonia directly, they are classified as ammonotelic organisms.

**Final Answer**: Bony fishes are ammonotelic.

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