What was the purpose of the vinegar in the third trial? test the effect of raising pH on enzyme action served no purpose serve as a control test the effect of lowering pH on enzyme action

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

Aplant cell has vacuoles and a cell wall