An advertising company charges $40 per half-page advertisement and $75 per full-page advertisement. Michael has a budget of $800 to purchase 13 advertisements. (a) Define a variable for each unknown and write a system of equations to represent the situation.

(b) How many half-page advertisements does Michael purchase? Show your work.

(c) How many full-page advertisements does Michael purchase? Show your work.

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.  

sorry i got nothing

step-by-step explanation:

(2,6)

step-by-step explanation:

cause i just did this and got the answer

you're welcome