Which kind of action is a cause of air pollution?
a. poisons are released into a major river.
b. gasoline is burned by a car engine.
c. trash is dropped in a national wildlife preserve.
d. tuna are fished to extinction.

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.