Which characteristics are typical of a human population in the postindustrial stage?

A. Exponential population growth
B. High birthrate and death rate
C. High and stable total population size
D. Sharply dropping birthrate and death rate

Which statement about variation is true? a) all phenotypic variation is the result of genotypic variation.b) all genetic variation produces phenotypic variation.c) all nucleotide variability results in neutral variation.d) all new alleles are the result of nucleotide variability.e) all geographic variation results from the existence of clines.