What is the frequency of an event?
a. probability
b. degree
c. expected occurrence
d. identification

Option A, Probability

Explanation:

Probability defines the possibility of occurrence of an event.  

Let "n" be the total number of desired outcome of an activity and "A" is the sum of all possible outcomes. Thus, in this case probability is defined by following mathematical relation –  

For example -  

Calculate the probability of occurrence of head when a coin is tossed one timed ?

Here, Total number of desired outcome i.e head when a coin is tossed once  

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.

and after water is usually warmed by the sun the water temperature raises and then evaporates .