i believe the answer is d. hope it helps
It’s someone’s opinion so the key word “best hints that it an opinion so to be objective is to be unbiased. If you're objective about something, you have no personal feelings about it.
Crossing over occurs at the four-strand stage when two homologous chromosomes, each consisting of a pair of sister chromatids, are paired. Each crossover involves just two of the four strands and generates two recombinant strands.
Hope this helps!
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