How are the respiratory and circulatory systems similar?

both systems provide glucose and other substances to cells.

both systems regulate blood flow throughout the body.

both systems remove carbon dioxide from the body.

both systems send messages to the nervous system for breathing.

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.