The Darwin-Wallace theory of evolution by natural selection

They knew nothing of genes ore mutations, so did not understand how natural variation could arise or be inherited. Nevertheless, they realised the significance of variation and their observations and deductions can be summerised briefly as follows

Observation 1: Organisms produce more offspring than are needed to replace the parents

Observation 2: Natural population tend to remain stable in size over long periods

Deduction 1: There is…