Which one of the following is not correct?

Question

Which one of the following is not correct?, The work done on the evening primrose by Hugo deVries laid the foundation of the mutation theory., Single-step large mutations are known as saltation and were considered to be the main factor in causing speciation., Darwin advocated that variations are always large but heritable changes., Branching descent and natural selection are the two key concepts of the Darwinian Theory of Evolution.

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Charles Darwin gave the theory of evolution based and believed that evolutionary changes are slow and gradual process. He suggested that variations occurring in the organisms whether large or small tend to be heritable. These variations gradually lead to the formation of new species. Hugo de Vries gave the theory of mutation based on his work on evening primrose.

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