Deviance is variation from a set of norms or shared social expectations.
a) true
b) false

True.

Explanation:

In sociology, any action or behaviour of an individual which results in the violation of the social norms is called deviance. The social norms here may include both the formally enacted law and informal violation. Those who do not follow the norms that everyone agrees to follow are labelled as a deviant. This can also result in them being considered as outcasts from society.

Though the term deviance has a negative essence, the violation of social norms does not ever mean a negative action or behaviour because social norms vary from culture to culture. for instance, the violation of social acts may be considered as deviant in one culture but can be seen as a normal action in another culture.

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

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sorry if this doesn't