(xy + 2x2y – x2 + 6x3) – (2xy – 6x2y + 4x2 – 6x3) – ( – 2x3 + x2y) + ( – x3 + 4xy + 3x2y – 2x2)

=-2(xy-6y-5)

Step-by-step explanation: multiply -(2xy-6 x 2y+ 4 x 2 -6 x 3) remove the parenthesis -2xy + 12 y - 8 +18 calculate -2xy+12y-8+18 factor the expression -2xy + 12y + 10 solution -2 (xy- 6y-5)

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.  

my guess would be b and d, but i didn’t actually get out the pen and paper. lol