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 choose... have enough evidence because choose... had choose...

Explanation:

X - rays are known to be mutagenic (cause mutations) due to their ionizing radiation, which can damage DNA. So a scientist studying this would have evidence. The correct verb form for "the scientist" (third - person singular) is "does".

Answer:

The scientist does have enough evidence because (assuming the context of X - rays' mutagenic properties, the first drop - down should be "does").