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Answer:

because some chemical reactions release gases which may be odourless or may have smell, in order to identify it it is necessary to have a good sense of smell.

Smell is vital for survival of most humans and animals as it enables them to track food and water, find a mate and even communicate. Although our sense of smell is not as acute as other animals we know that humans are able to detect up to 10,000 different odor molecules.
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