Question

GIVE REASON:
1)Parasitism is a non-mutual relationship.

2)Air is a mixture of several gases.

Answer 1

1) Parasitism is a non mutual relationship because when the parasite enters in the body of the host and starts to use the nutrients there is no benefit for the host and will eventually die.
2) Air contains many gases like CO2 SO2 argon etc. and dust particles and microorganisms
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Answer 2

1)  Parasitism is a kind of symbiosis, a close and persistent long-term biological interaction between the parasite and its host. Unlike commensalism and mutualism, the parasitic relationship harms the host, either feeding on it or, as in the case of intestinal parasites, consuming some of its food.

2)The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water vapor, argon, and carbon dioxide, and very small amounts of other gases. ... It is separated into its components by fractional distillation of liquefied air.