Why is water necessary for living organisms? a. all organisms need water to stay clean. b. all organisms need water as an energy source. c. all organisms need water to transport chemicals into their cells. d. all organisms live in the water.

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.