Although organisms from every kingdom play a role in all biogeochemical cycles, which essential role can only be performed by bacteria
A . Transpiration of water vapor
B. Combustion of carbon compounds
C. Decomposition of organic matter
D fixing of nitrogen into nitrates

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.