Arectangle has a long side of length 8.5 cm.

its perimeter is 24 cm.

work out the length of the shorter sides.

The length of the shorter side is 3.5 cm.

length = 8.5 cm

perimeter = 24 cm

perimeter of a rectangle = 2(l + w)

Therefore,

24 = 2(8.5 + w)

24 = 17 + 2w

subtract 17 from both sides

24 - 17 = 2w

7 = 2w

w = 7 / 2

w = 3.5 cm

Therefore, the length of the shorter side is 3.5 cm

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hope you understand. this, I think, is the right answer.

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.