 
 <translate> Bottleneck effect occurs when a population suddenly gets much smaller. Effects of bottlenecks are unpredictable . When a population suddenly gets much smaller the effects are unpredictable.
So, the final answer is (E). <hau> Tasirin kwalban yana faruwa ne lokacin da yawan jama'a ya ragu sosai ba zato ba tsammani. Sakamakon cikas ba za a iya tsammani ba. Lokacin da yawan jama'a ba zato ba tsammani ya zama mafi ƙanƙanta sakamakon ba zai yiwu ba. Amsar ita ce (E). 