White shapes and black shapes are used in a game. Sone of the shapes are circles. All of the other shapes are squares. Tye ratio of the number of white shapes to the number of black shapes is 5:11. The ratio of the number of white circles to the number of white squares is 3:7. The ratio of the number of black circles to the nunber of black squares is 3:8. Work out what fraction of all the shapes are circles.

i believe the correct answer is b.

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.  

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.