About 60% of the base pairs in a human DNA molecule are A+T. If the human genome has 3.2 billion base pairs of DNA, about how many times will the following restriction sites be present?

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 type of respiration takes place when there is no oxygen present

This is collection of data made by comparing objects in standard units. in science, the units are metric.