Which of the following types of isolation is important for speciation?

How did Darwin explain the origin of species?

Genetic drift operates in

What is the variation of traits among the members of a species called?

Which of the following are correct examples of evolution by anthropogenic action?
$(a)$ Darwin's finches on the Galapagos Islands
$(b)$ Herbicide-resistant weeds
$(c)$ Drug-resistant eukaryotes
$(d)$ Man-created domesticated breeds like dogs

The diagram below shows the process of natural selection. Choose the correct option for $P, Q$ and $R$.