19-foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 11 feet from the base of the building. how high up the wall does the ladder reach?

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.