Simplify the expression:
7r–3r+9r

13r

Step-by-step explanation:

-First, collect like terms by calculating the sum or difference of their coefficients.

(7-3+9)r

-Then, calculate the sum or difference and you get..

13r.

Hope this helps! :)

13r

I think it is correct but just try making sure oater sorr if I a wrong though

hope this .

r3t40

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.