CAN SOMEONE PLEASE HELP ME???

Choose the best definition for function?
A. The inputs of a relation
B. The outputs of a relation
C. The movement of a graph either vertically or horizontally
D. A special relation where every input has only one output

PLZ HELP! BE HONEST PLZ! :) THANK U!!!
PLZ BE 100% SUREE...IM STRUGGLING WITH MY GRADE RIGHT NOW :(

b

Step-by-step explanation:

if you have the same out put then its not a function but if they are all diffrent then it is a function.

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.