Which type of stimulus is an allergen, such as pollen?
a.
inborn stimulus
b.
external stimulus
c.
response to a stimulus
d.
internal stimulus

dude really come on

explanation:

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.