Josephine wants to put wallpaper border around the ceiling. the lenth of the border is 8 and 1/2 and the wisthn is 10 and 9/12. what is the perimeter.

Assuming the ceiling has a rectangular shape, the perimeter is the sum of the lengths of all the sides, hence twice the sum of length and width.

2(8 1/2 + 10 9/12) = 2(18 +6/12 +9/12)

= 2(18 +15/12)

= 2(19 3/12)

= 2(19 1/4)

= 38 1/2 . . . . . the room's perimeter

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.