One medical reason is diabetes and those who need food or else they faint. Diabetes need a balanced diet in SUGAR, and just like me, there are people, (I don't know what the sickness is called), who need a lot of food to eat and water to drink or else they start to get dizzy and fainnt. So that's why balanced diets vary.
The mitochondria provides the cell with energy
Answer:
It allows water and other molecules to enter and exit the system.
Explanation:
Plants have both a cell membrane and a cell wall. These allow needed molecules, such as water, to enter the cell. Both the cell wall and the cell membrane are semi permeable, which means that they choose what can enter and leave the cell. Molecules like water and other useful things to the cell enter it, and things such as waste leave the cell through the membrane and wall.
Remember that only plant cells have cell walls. Animal cells only have a cell membrane. But both the wall and membrane have the same purpose.
