Random genetic drift in a population probably results from

$XX$ is a type of selection process in evolution. $XX$ promotes population changes in one particular direction. $XX$ favours small or large-sized individuals,and the mean size of the population changes in $XX$. Identify $XX$.

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 $Q$.

Industrial melanism is an example of which of the following?

'Population tends to increase geometrically,while food supply increases arithmetically'. This concept was put forward by

Who stated that variations which are heritable and which make resource utilization better for few will enable only those to reproduce and leave more progeny?