) *Answer is on course hero but is blurred sadly* Identify a further area for experimental investigation into transport across membranes. This may be a new investigation, or a further investigation of osmolarity.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

there's the proffessional site that will you.