According to  mutation was gradual while de Vries believed mutation caused   B  and hence called it 

A B C
1. Lamarck Saltation Speciation
2. Thomas Malthus Speciation Natural selection
3. Darwin   Speciation  Saltation
4. Wallance Natural selection Speciation

Subtopic:  Theory of Evolution & Lamarckism | Darwin's Theory | Summary of Darwin's Theory | Drawbacks of Darwin's Theory |
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Level 1: 80%+
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