Your answer is: <span>D) A series of ice ages followed by periods when the glaciers melted.</span>
I believe that it is water is necessary for cellular functions because all of the others could be the case without being 'essential' for life.
Hope i helped.
I am not sure on this but I think it would be B) sorry if this is not the correct answer
Biological dispersal is the act of movement of individuals from their birth site to a breeding site or from one breeding site to another. It is a phenomenon that contributes to gene flow and affects population genetics and species distribution. Also, it strongly affects population dynamics and induces changes on the ecosystem.