What winds are found in the upper troposphere?

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Me with these questions image attached