Which would least likely be a cause of natural selection? adaptation evolution overpopulation variation

Overpopulation would be the least likely cause of natural selection. Adaptation, evolution and variation are all causes of natural selection.

The correct answer is OVERPOPULATION.
Natural selection refers to the process by which living organisms which are better adapted to their environment tend to survive more compare to those that are less able to adapt. The four factors that leads to natural selection include: overproduction of offspring (overpopulation), variation, selection and reproduction of adaptation. It is not compulsory for overpopulation to occur for natural selection to take place, but it must be a possibility in order to create selective pressure on the concerned population.