my bag contains two book each of weight 3/7 kg and three folders each of weight 5/21 kg. what is the total weight in the back

Step-by-step explanation:

2 x 3 = 6 so 6/7 kg

5x 3 = 15/21 kg

6/7 x 3 = 18/21

18/21 + 15/21 = 23 / 21 kg OR 1 2/21 kg

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.