Which one of the following groups contributes the maximum number of sp

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Which one of the following groups contributes the maximum number of species to the biosphere?

Reptiles
Mammals
Insects
Birds
This question was previously asked in
UPSC Geoscientist – 2022
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Insects constitute the largest group of animals on Earth, both in terms of the number of species and the number of individuals. Their diversity far surpasses that of reptiles, mammals, or birds.
– Insects belong to the class Insecta, which is the most speciose class within the phylum Arthropoda.
– Estimates for the number of insect species vary widely, but most sources agree that there are millions of species, significantly more than all other animal groups combined.
Other highly diverse groups include fungi, bacteria, and certain plant groups, but among the animal groups listed in the options, insects are overwhelmingly the most numerous in terms of species count in the biosphere.

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