The genetic differentiation of among populations might be caused by human selective pressures and barriers to gene flow.
群体间一定程度的遗传分化可能是人为选择压力和基因流障碍引起的。
She believes the female dolphins invented the method because of the "selective pressures they face while raising a calf as long as they do," about 4 to 5 years.
她坚信是雌海豚发明了这种办法是因为它们需要用4到5年的时间来养育一只小海豚，面临着选择的压力，它们得发明出与众不同的方法。
She believes the female dolphins invented the method because of the "selective pressures they face while raising a calf as long as they do, " about 4 to 5 years.
她坚信是雌海豚发明了这种办法是因为它们需要用4到5年的时间来养育一只小海豚，面临着选择的压力，它们得发明出与众不同的方法。
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