In forming the theory of evolution by natural selection, Darwin was greatly influenced by
- AMutations of Hugo de Vries
- BMalthus idea of population control
- CEnvironmental factors
- DLamarck acquired characters
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The scientists believe that evolution is gradual. But extinction, part of evolutionary story, are 'sudden' and 'abrupt' and also group-specific. Comment whether a natural disaster can be the cause for extinction of species.
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