What facilitates a cells ability to exchange materials between the cell and its environment?

Differentially permeable membrane.

Explanation:

Differentially permeable membrane is defined as the membrane that allows the passages of materials between the cell, and it's environment. It's allow the movement of some particles such as small molecules not large molecules like solutes.

It is also known as semipermeable membrane. It is also important for maintaining turgidity, and help to retain the ability to absorb solutes.

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image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.