2 1/4 = 1 2/7 divied by x

x = 7/4

Step-by-step explanation:

2 1/4 = 1 2/7 ÷ x

change mixed numbers to improper fractions:

9/4 = 9/7x

multiply each side by 7/9 to isolate 'x':

9/4(7/9) = x

63/36 = x

x = 7/4 (simplified)

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.