The difference between twice a number and 11 is -23

12

Step-by-step explanation:

Let the number be n.  Then n - 11 = -23.

Adding 11 to both sides results in n = -23 + 11, or n = -12.

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.