Bottleneck events are always caused by the death of most of a species’ population. select the best answer from the choices provided t f

False. Bottleneck events are caused when size of a population sharply declines, and there are multiple causes of this decline. Often it involves the death of most of a species' population, for example, following a natural event, such as an earthquake or famine, or as a result of human behaviour, such as genocide. However, it can also be as a result of a separation event or mass migration during which the majority of a species does not die.

Generally travels west to east but often shifts to north and south