Question

1). How do aquatic animals survive in arctic region (hint: the density of water is maximum at 4°C)
2).How a hot air balloon works?
Just tell me the correct answer otherwise don't
hint: this questions are from Ch density​

Answer 1

1. When cooled from room temperature, liquid water becomes dense but at 40C pure water reaches its maximum density. As it is cooled it expands to become less dense. So the layer of ice floats on water as insulating layer. The warm layer settles at the bottom in winters and so aquatic life exists.
2. Hot air balloons work because hot air rises. By heating the air inside the balloon with the burner, it becomes lighter than the cooler air on the outside. This causes the balloon to float upwards, as if it were in water.

Answer 2

Answer:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

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