Organisms that synthesize their own c-c molecules from single-carbon starting materials are named while those that absorb preformed c-c compounds produced by other organisms are organisms that synthesize their own c-c molecules from single-carbon starting materials are named while those that absorb preformed c-c compounds produced by other organisms are phototrophs; chemoorganotrophs chemoorganotrophs; heterotrophs autotrophs; chemoorganotrophs autotrophs; heterotrophs

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.