When some substances can pass across them but others cannot biological membranes are said to have?

The biological membranes like the cell membrane or the membrane enclosing the organelles are all semi-permeable. The semi-permeability is the property of membranes that gives them the ability to selectively allow the movement of particles/ solute/ solvent across it. The semi-permeability allows the cell to maintain a concentration gradient across its membrane that further drives various cellular processes within the cell.

the correct option is option a

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles