The ultimate source of organic evolution is

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as

The process of natural selection was named as survival of the fittest by . . . . . . .

Which of the following is related to reproductive isolation?

What do hummingbirds and hawks represent?

Observations from England support evolution by natural selection. Before industrialization, $P$ moths were more abundant on trees, whereas after industrialization, $Q$ moths were more abundant. Identify $Q$.