In the oceans, the environment is perpetually dark at

  • A

    More than $100\,m$

  • B

    More than $500\, m$

  • C

    Less than $100 \,m$

  • D

    Less than $500 \,m$

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In summer, when out side temperature is more than our body temperature, we sweat profusely. The resulting evaporative cooling, similar to what happens with a desert cooler in operation, brings down the body temperature. In winter when the temperature is much lower $37^o C$, we start to shiver a kind of exercise which produce heat and raises the body temperature. They are called.

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In the mountains, there is a lot of moisture and water and still the plants are xerophytes, because

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A person at $15000$ feet above sea level develops certain symptoms in $8-24 $ hours, these are