On a cold winter day, Sohan put a room heater near his aquarium, which made water in the aquarium warın but not hot.
What could happen due to this?

Options

A. Fishes would feel more comfortable in warm water due to more availability of oxygen.
B. Fishes would suffocate due to less availability of oxygen for breathing.
C. Fishes would die due to decrease in amount of carbon dioxide dissolved in warm water.
D. Fishes would feel more comfortable in warm water due to decrease in amount of dissolved carbon dioxide.

Explanation

To analyze the situation where Sohan puts a room heater near his aquarium on a cold winter day, we can break down the potential effects step by step:

### Step-by-Step Solution:

1. **Understanding the Temperature Effect**: When Sohan places a room heater near the aquarium, the water temperature increases. Fish are ectothermic (cold-blooded) animals, meaning their body temperature is regulated by the surrounding water temperature.

**Hint**: Think about how temperature affects the metabolic processes of fish.

2. **Impact on Oxygen Levels**: Warmer water holds less dissolved oxygen compared to cooler water. As the water warms up, the amount of oxygen available for the fish decreases.

**Hint**: Consider the relationship between water temperature and gas solubility.

3. **Fish Comfort and Breathing**: Although fish may initially seem more comfortable in warmer water, the reduced oxygen levels can lead to breathing difficulties. Fish rely on dissolved oxygen in the water to breathe through their gills.

**Hint**: Reflect on how fish breathe and what they need to survive.

4. **Consequences of Low Oxygen**: If the oxygen levels drop significantly, fish may start to suffocate. This can lead to stress, lethargy, and ultimately death if the situation is not corrected.

**Hint**: Think about what happens to living organisms when they do not get enough oxygen.

5. **Conclusion**: Therefore, the primary consequence of warming the water in the aquarium due to the heater is that the fish could suffocate due to the decreased availability of oxygen.

**Hint**: Summarize the main point: the heater can be harmful because it reduces oxygen levels in the water.

### Final Answer:
Due to the warming of the water from the heater, the fish in the aquarium could suffocate because the oxygen levels in the water decrease.