Question

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

Explanation:

Disasters can cause a significant reduction in population size. When a large number of individuals die due to a disaster (such as a flood, fire, or epidemic), only a small subset of the original population's genes survive. This is known as a bottleneck effect, which reduces genetic variation. Toxins may affect some individuals but don't typically have the same widespread, drastic impact on genetic variation as disasters. Predator - prey relationships and competition are more about population dynamics and survival of the fittest in an ongoing sense rather than a sudden, large - scale reduction of genetic variation. A new habitat can sometimes lead to speciation and potentially more genetic diversity as organisms adapt. An increased food supply usually supports a larger population, which may not decrease genetic variation.

Answer:

disasters