Ammonotelic animals are

Options

A. Cockroach
B. Nereis
C. Pila and Starfish
D. Elasmobranch fishes

Answer

**Step-by-Step Solution:**

1. **Understanding Ammonotelic Animals**:
- Ammonotelic animals are those that excrete ammonia as their primary nitrogenous waste product. Ammonia is highly toxic and must be eliminated quickly from the body.

2. **Identifying Examples**:
- The question lists several organisms: cockroach, Nary's, Pila, starfish, and elasmobranch fishes. We need to determine which of these are ammonotelic.

3. **Analyzing Each Organism**:
- **Cockroach**: This organism is not ammonotelic; it is uricotelic, meaning it excretes uric acid.
- **Nary's**: This genus of marine worms is known to be ammonotelic, as they excrete ammonia.
- **Pila**: This is a genus of freshwater snails that also excretes ammonia, making it ammonotelic.
- **Starfish**: Starfish are also ammonotelic, as they excrete ammonia as their nitrogenous waste.
- **Elasmobranch Fishes**: These include sharks and rays, which are ureotelic, meaning they excrete urea instead of ammonia.

4. **Conclusion**:
- From the analysis, the ammonotelic animals among the given options are Nary's, Pila, and starfish. Therefore, the correct answer to the question is that ammonotelic animals include Pila and starfish.

**Final Answer**: Ammonotelic animals are Pila and starfish.

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