how is addition of undesirable substances and change in temperature affect the water life
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The addition of undesirable substances:
These substances could be fertilisers and pesticides used in farming or they could be poisonous substances like mercury salts which are used by paper industries. These could also be disease causing organisms, like the bacteria which cause cholera.
A change in temperature:
Aquatic organisms are used to a certain range of temperature in the water body where they live and a sudden marked change in this temperature would be dangerous for them or affect their breeding. The eggs and larvae of various animals are particularly susceptible to temperature changes.
These substances could be fertilisers and pesticides used in farming or they could be poisonous substances like mercury salts which are used by paper industries. These could also be disease causing organisms, like the bacteria which cause cholera.
A change in temperature:
Aquatic organisms are used to a certain range of temperature in the water body where they live and a sudden marked change in this temperature would be dangerous for them or affect their breeding. The eggs and larvae of various animals are particularly susceptible to temperature changes.
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Answer:
The aquatic animals die.
Explanation:
The undesirable substances could be poisonous and the animals are not comfortable during temperature change in both circumstances the aquatics animals have risks of losing their lives.
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