Question

molecular evidence: if two species share a high percentage of their dna, it is likely that...
human: aat-gca-tac-gga-tga-cat-tta
dog: aat-gga-ttt-gaa-tga-caa-cta
chimpanzee: aat-gga-tac-gga-tga-cat-tta
fly: att-aca-tat-cgc-cgt-cat-tta
mushroom: att-aaa-tat-cca-aaa-caa-cta
their common ancestor lived long ago.
their common ancestor is more recent.
they do not share a common ancestor
one species descended directly from the other.

Explanation:

Molecular evidence shows that species with more similar DNA sequences likely have a more recent common ancestor. This is because DNA accumulates mutations over time. The more mutations (differences in DNA), the longer ago the common ancestor existed. Here, high DNA similarity implies a recent common ancestor.

Answer:

Their common ancestor is more recent.