Which statement does NOT correctly describe a difference between a rock and a mineral? A. Minerals are found in all types of environment while rocks are found in specific environments.
B. A mineral has a definite crystal structure which is not the case in a rock.
C. The hardness of a mineral is greater than that of a rock.

D. The composition of a mineral is uniform while a rock's is not.

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.