Question

The theory of ________ proposes that some chance variations passed down from parent to offspring are adaptive and help the organism to survive and reproduce in a specific environment.

Answer 1

evolution

As animals evolve over hundreds of thousands of years, the traits or characteristics that help them survive become dominant over the undesirable trait that provides no benefit to them. Traits are passed down from parent to offspring, so that is how the desirable traits stay in a population.