Some elephants in the scrub jungles of africa had long trunks with which to reach out for leaves. they were able to reproduce more successfully than elephants with short trunks. which aspect of darwin's theory is this scenario an example of?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.