Which is a characteristic feature of the members of the group tunicata?
a. they regulate water with of a siphon.
b. they have a tough calcium carbonate exoskeleton.
c. they feed on phytoplankton using tentacles.
d. they possess a water vascular system.

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.