The best answer for this question would be:
environmental conditions affect the pollination of plants.
Because it depicts the starting information or theory that the researcher is stating. His theory is that the conditions of the plant will affect the plant, and therefore experiments on the procedure to prove his theory.<span> </span>
The answer is, d. consists of circular DNA molecule . The circular DNA is found in bacterias and archeas (which are prokaryotic organisms). The picture shows bacterial chromosome.
A homologous<span> structure is an organ, system, or body part that shares a common ancestry in multiple organisms. So the Structure is said to be C) Homologous. Hope this Helps</span>