Question

an organisms fitness depends on its _________.
ability to swap genetic material with other organisms
population
ability to survive and reproduce
ability to mutate
physical size

Explanation:

In evolutionary biology, an organism's fitness is defined by its ability to survive in its environment and reproduce successfully. This is a fundamental concept in natural selection. Swapping genetic material (like in sexual reproduction) can contribute to genetic diversity but is not the direct definition of fitness. Population size is a group - level characteristic and not an individual organism's fitness measure. Mutation is a source of genetic variation but not the determinant of fitness itself. Physical size may or may not be related to an organism's ability to survive and reproduce depending on the environment.

Answer:

ability to survive and reproduce