Can someone please help me find the value of t!

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.  

sorry for any inconvenience this may have caused try again

try again.

1. 28 over 9

2. i don't know this i'm sorry : (

3. 19, because the number of books is 95 over 4 divided by 5 over 4

4. 7 and 1 over 3 divided by 1 over 6

5. 9.5

6. $124

7. 2 over 9

8.   (−$8) ⋅ 12

9. -67.2

10. $ 170.00

11. -27 feet

12. 5.7 with bar over 7

hope i !