Which structures in the cell membrane allow the cell to communicate with and interact with its environment? A. Phospholipids

B. Cholesterols

C. Proteins

D. Carbohydrates

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

most community's take hundreds of years to become stable

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.

the answer is b.) hydrogen bonds between bases.