One advantage to being an endotherm (instead of an ectotherm) is that an endotherm
a. can generate its own body heat.
b. needs less energy to maintain homeostasis.
c. needs more energy to maintain homeostasis.
d. can increase its body heat by sweating.

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.