Mr. Ramirez orders drumsticks and sheet music for a group of students. One pair of drumsticks costs $1.50, and the sheet music costs $3.50. He has z students in his group. It works well for his 7th graders, so Mr. Ramirez decides to do the same thing for his 6th and 8th grade groups, who have the same amount of students as the 7th grade. Which expression could he use to represent all 3 grades?

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.