define the term (1)semi-permeable membrane (2) osmosis tell the answer i will mark u as brainlist​

a)the outermost part of an animal cell that selectively allows things to pass through and come out.

b) the passing of water molecules from higher conc. to lower conc.

(a) Semi-permeable membrane:

A semipermeable membrane is a membrane that only allows the movement of solvent molecules but restricts the movement of solute particles across the membrane.

(b) Osmosis:

The process of movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane is called osmosis.

When two nearby concentrations are different, materials will tend to spread out to equalize the concentration. For example, if you put a drop of food colouring in some water it will gradually spread through the whole water.