If you were to randomly survey 50 people from the phone books of 20 randomly chosen cities, would this be a random sample? Why or why not?

It would not be a random fair sample, as the sample categories each should be 30 minimum for such sample tests to be effective. There are 20 cities so the maximum any category group can be sampled is 3 per city and 2 from other cities as 50/2 = 25 = 2.5 each. Therefore by having data from other cities this creates 20 other categories as the samples are based on geographic wider scale such survey would require 30 from each city to show effectiveness and it would require reliable data of 30 from from each city instead of 2-3 each city.

Step-by-step explanation:

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.