How has man's presence in the Sahel contributed to the potential of desertification of the area? ALL BUT ONE could apply. A) deforestation
B) climatic changes
C) overgrazing by livestock
D) the buildup of salt in irrigated soils

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

the answer is:

carbon dioxide