If the solute concentration of the solution surrounding the cell is 0.9%, what would the solute concentration of the plant cell be? How do you know? I NEED HELP ASAP PLEASE

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