1. Robert and Sarah Jackson both work. Robert gets paid twice a month. After taxes,
his paycheck totals $885.50. Sarah gets paid
weekly. Her take-home pay is $357.25

20

step-by-step explanation:

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.  

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right