Upper reaches of a river does not possess many living beings because of

Low temperature

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High speed

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Both low temperature and high speed

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Solution

The correct option is B Both low temperature and high speed
The upper reaches of a river is considered as dead thing as it does not posses many living beings. The reason behind this is low temperature and high speed at upper reaches of a river. Due to high turbulent water on the upper reaches, a wider water surface is exposed to the air. This decreases the temperature. Due to low temperature and high turbulent water, there are very less living beings present in the upper reaches of a river.
Thus, the correct answer is 'Both low temperature and high speed.'

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