Question 1 is certainly D. and number 2 is B because it causes communication with the musicle!
The cell membrane is a lipid bilayer that prevents that passage of water and ions. This allows cells to maintain a higher concentration of sodium ions out the outside of the cell. Cells also maintain a higher concentration of potassium ions and organic acids on their inside.
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A is your answer I believe because they do indeed provide a way to review other scientists work and or experiments
