What is the possible reason for the development of resistance in pests against crop-destroying agents?

As a result of the excessive use of herbicides and pesticides,which types of varieties were selected in a short period?

In recent years,$mt-DNA$ and $Y$-chromosome $DNA$ sequences have been used for the study of human evolution because:

The Natural Selection Theory of Darwin is objected to,because it:

In the case of the peppered moth $(Biston \text{ } betularia)$, the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:

Select the correct option for gene flow.