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which of these is an example of gene flow?
a) german immigrants settle in a colony in eastern pennsylvania without mixing with the locals.
b) a few black sparrows join a population of brown sparrows and mate with them.
c) indiscriminate hunting reduces the blue whale population, which later revives.

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.