Which statement best describes a link between the nervous and excretory systems?
A. The kidneys return excess salt from the blood to neurons.
B. Water transmits action potentials from neurons to nephrons.
O C. Signals from the brain control how the kidneys function.
D. The ureters produce hormones used in the nervous system.

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.