Question

does the scientist have enough evidence to support x-rays as a source of mutations?
complete the sentence by selecting the correct answers from the drop-down menus.
the scientist does have enough evidence because
choose... had
both sets of parents
the parents exposed to x-rays
the parents not exposed to x-rays

Explanation:

To determine if X - rays cause mutations, we need to compare groups. The parents exposed to X - rays are the experimental group. If their offspring have more mutations (implied by the context of the question), then there is evidence. So the correct choice for the blank is "the parents exposed to X - rays" as we compare their offspring's mutation rate (or related metric) to others.

Answer:

The scientist does have enough evidence because the parents exposed to X - rays had (the relevant mutation - related outcome, e.g., more mutations in offspring, though not fully stated here but inferred from the experimental design logic). The correct option for the drop - down is "the parents exposed to X - rays".