Question

which of the following can typically decrease genetic variation? toxins predator - prey relationships competition new habitat disasters increased food supply

Explanation:

Genetic variation typically increases a population's ability to adapt and survive, so it does not cause a decrease. Toxins can harm organisms and reduce population size. Predator - prey relationships can lead to a decrease in prey populations. Competition for resources can limit population growth. New habitats usually provide more resources and tend to increase populations rather than decrease them. Disasters like floods, fires can kill organisms and reduce populations. An increased food supply generally supports population growth, not decrease.

Answer:

toxins, predator - prey relationships, competition, disasters