As we know that ,
Humans come under the class Animals.
Birds come under the class Aves.
From above it is clear that option ( C ) represents the best relationship between Humans, Birds and Animals.
It is irrelavent
Clearly, though all the alternatives may form a part of the atmosphere, the air is the most vital part, without which there can be no atmosphere. So, the answer is (b).
It is true
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