I believe your answer would be:
A. Fossils.
Explanation:
Because they are the preserved remains or traces of animals, plants, and other organisms from the past. They're also important evidence for evolution because they show that life on earth was once different from life found on earth today.
Hope I helped, good luck! =)
there are two main types of explosive events in the Sun: solar flares and coronal mass ejections. Impulsive energy release in solar flares is one of the most dynamic and highly energetic phenomena in the Solar System
Yes, crossing over does not occur during mitosis. As mitosis is simply the duplication of cells, there is no gene variation that comes from crossing-over.
