Using a two-way radio, Melissa can talk to anyone within an 8-mi radius of her location. Oscar is 30° west of south of Melissa's location. What is Oscar's exact location, relative to Melissa's location, at the greatest distance where they can talk using two-way radios?

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.  

since no one answered yet i will give it a shot, not completely sure tho.

i think it should be y=cos(x+2pi), (third answer, answer c)

good luck.