Question

a population bottleneck is often caused by _______.

o colonization of a new habitat
o new mutations that arise in a population
o introduction of individuals from a different population
o a natural disaster

Explanation:

A population bottleneck occurs when a population's size is suddenly and drastically reduced. Natural disasters like earthquakes, floods, or wild - fires can cause significant mortality in a population, leading to a bottleneck. Colonization of a new habitat can lead to founder effects, new mutations are not the main cause of bottlenecks, and introduction of individuals from another population can increase genetic diversity rather than cause a bottleneck.

Answer:

a natural disaster