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Over 2 million species have been documented by scientists, but only scratches the surface. Estimates vary widely, creating the range between 3 million to 100 million distinct species. The vast majority of species on the Earth are insects, while mammals and corals form the smallest group.
21 sats \ 1 reply \ @Riberet 1 Jun
Aren't arachnids and insects not in the same group?
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They have structural and evolutionary differences.
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