Landon cut a cold apple into slices, placed the slices on a plate, and left the plate on the kitchen counter. Over the next two hours, Landon observed that the apple slices started to dry out and turn brown. He also noted that the apple slices warmed to room temperature, and a couple of fruit flies started to fly around them. Which of Landon's observations provides evidence of a chemical reaction?

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.