In an ? environmental the solute concentration is equal both inside and outside of the cell.

isotonic

Explanation:

in an isotonic environment, the concentration of the solute inside is equal to that outsde the cell.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.