Many cultures and religions have customs which deal with the way they use the land. for example, in judaism, it is required that a field be left fallow (unplanted) every seventh year. what is one beneficial effect of customs like this? a) they prevent the land from being overused. b) they cause less competition among farmers. c) they make the land more valuable to farmers. d) they force people to farm more recklessly at other times.

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.