Meiosis and sexual reproduction are, in large part, responsible for genetic variation within a population. meiosis supports genetic variation in several ways. all but one applies to meiosis and genetic variation.
a) independent assortment of chromosomes
b) recombination of chromosomes during crossing over
c) replication of chromosomes at the beginning of the process
d) only one of the two alleles for a trait is passed to offspring

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.