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1. triangular

2. triangles

3. rectangles

4. rectangular

5. rectangles

6. number of faces = 6

   number of edges = 12

   number of vertices = 8

7. number of faces = 5

   number of edges = 9

   number of vertices = 6

8. number of faces = 7

   number of edges = 15

   number of vertices = 10

9. triangular

10. triangles

11. square

12. square

13. triangles

14. number of faces = 6

    number of edges = 10

    number of vertices = 6

15. number of faces = 7

    number of edges = 12

    number of vertices = 7

16. cube

17. square pyramid

18. triangular pyramid

19. triangular prism

20. rectangular prism

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.