Which statement is correct for a plant cell? O A plant cell membrane forms a thick wall.
O A plant cell does not have a cell membrane,
O The cell membrane is inside the cell wall,
O The cell membrane is outside the cell wall,

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.