Why are there so many types of species in our planet

Scientists assumed that, the longer time a group of organisms has to evolve, the more species there will be in that group. New research suggests this isn’t necessarily so.

Daniel Rabosky at the University of Michigan and colleagues have been exploring an underlying and very profound question about biodiversity, the variety of life in our world. That is, why are some groups of organisms so much more diverse than others? This question is sometimes spoken about as nature’s inordinate fondness for some creatures, a turn of phrase attributed to the geneticist and evolutionary biologist J.B.S. Haldane. Haldane wrote in his 1949 book What is Life?:

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paper covers rock.

explanation:

rock only smashes scissors.