Can y’all help me ...

b=4

Step-by-step explanation:

1. Write equation out

•3b-6+b-2=180

2. Combine like terms

•4b-8=180

3. Add the 8 to both sides

•4b-8=180

+8. +8

4b=188

4. Divide by 4

•4b=188

÷4. ÷4

b=47

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.  

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3