If mitosis happens in our gonad cells that produce egg or sperm. How will it impact the progeny's chromosome number? Emphasize also the point why is meiosis so very important. I dont get it

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which characteristics are typical of a human population in the postindustrial stage?

Abird is flying in the air at a 4 m/s. if the mass of the bird is 7kg what is it’s kinetic energy