The main function of the digestive system is to break food down into molecules that can be absorbed by cells. How are the food molecules absorbed into the cells to start the cellular respiration process? A.
Food molecules are broken down by oxidation and then released by cells.

B.
Food molecules are released into the cells by the respiration process.

C.
Food molecules are absorbed through the cell wall.

D.
Food molecules are absorbed through the cell membrane.