Marked temperature changes in aquatic environment can affect

Options

A. breeding of animals
B. more growth of aquatic plants
C. process of digestion in animals
D. availability of nutrients

Explanation

### Step-by-Step Solution:

1. **Understanding the Aquatic Environment**:
- The aquatic environment is where aquatic animals live, including fish, amphibians, and various invertebrates.

2. **Identifying the Type of Animals**:
- Most aquatic animals are cold-blooded, meaning their body temperature is regulated by the surrounding water temperature. They cannot maintain a constant internal body temperature.

3. **Impact of Temperature Changes**:
- When there are marked temperature changes in the aquatic environment, it directly affects the body temperature of these cold-blooded animals.

4. **Effects on Reproduction**:
- The eggs and larvae of aquatic animals are particularly sensitive to temperature changes. Fluctuations in temperature can disrupt their development and survival rates.

5. **Analyzing the Options**:
- The question provides four options:
- A) Breeding of animals
- B) More growth of aquatic plants
- C) Process of digestion in animals
- D) Availability of nutrients
- Among these options, the breeding of animals is most directly affected by temperature changes due to the vulnerability of eggs and larvae.

6. **Conclusion**:
- Therefore, marked temperature changes in the aquatic environment primarily affect the breeding of aquatic animals.

### Final Answer:
Marked temperature changes in the aquatic environment can affect the breeding of animals.

---