Atype of lichen grows on rocks at the base of a waterfall. which factor in the lichen's environment is abiotic?

I’m stuck on this question cuz i’m stupid sksksksk

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species

An alaskan spruce forest will burn easily once burned the forest regenerates fairly wuickly which statement best describes haw an alaskan spruce forest reacts to fire? it is resilient