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The identified species of all organisms ...

The identified species of all organisms on the earth range between 1.7 to 1.8 million. Global Biodiversity Information Facility and the Species 2000 have identified the number of species in each group of animals.
a. Name the group with maximum species identified.
b. Name the group with the less species identified.
c. Give an approximate number of mammalian species identified.

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a. Insects b. Viruses c. 4,650
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