What does the term humidity refer to?
a. a weather condition
b. a form of precipitation
c. a step in the water cycle
d. the amount of water dissolved in the air

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

c should be the answer

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.