Asubway in new york is located at 25 feet below sea level. in chicago a train is 27 feet above sea level. how much higher is the train than the subway?

All you have to do is add 25+ 27= 52

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.