A20-row theater has three sections of seating. in each section,
the number of seats in a row increases by one with each successive row. the
first row of the middle section has 10 seats. the first row of each of the two side
sections has 4 seats.
a. find the total number of chairs in each section. then find the total seating
capacity of the theater.
b. write an arithmetic series to represent each section.

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.