Question

individuals that are better fit for their environment have a greater chance to survive and reproduce than those that are less fit
founder effect
frequency
geographic separation
population bottleneck
natural selection
evolution
variation

Explanation:

The statement describes the concept of natural selection, where organisms with traits better suited to their environment are more likely to survive and reproduce. The founder effect relates to genetic drift from a small founding population, frequency is a general term, geographic separation is about isolation, population bottleneck is a type of genetic drift, and evolution is the overall change over time. Natural selection directly matches the described process of differential survival and reproduction based on environmental fit.

Answer:

natural selection (the option corresponding to "natural selection")