According to paragraph 4, why does the size of a population affect the likelihood of allopatric speciation? A. Because smaller populations are more likely than larger ones to become geographically isolated B. Because the gene pool of a small isolated population is more likely to undergo substantial change than is the gene pool of a larger population C. Because a isolated population can become a new species with substantially less change to its gene pool than would be required by a larger population D. Because smaller populations are more likely to be made up of stray animals or plants than larger populations are