I think the answer is water
(1) they keep toxic substances out of the cell;
(2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment;
(3) they separate vital but incompatible metabolic processes conducted within organelles.
I’m not sure what your asking. But if you have 2 different alleles of a gene it will be heterozygous
by experimenting the layers of the earth
