Question

the plasma membranes of cells specializing in absorption, like those in the small intestine, are folded into microvilli. what is the main advantage of this structure? it allows the cell to move and change shape. it increases the surface area for absorption. it provides a rigid structure to protect the cell from damage. it stores enzymes needed for digestion within the folds.

Explanation:

Microvilli are tiny projections on the plasma membrane of cells. Their main function is related to the cell's role in absorption. A larger surface area allows more substances to be absorbed. Moving and changing shape (first option) is more related to structures like cilia or amoeboid movement. A rigid structure (third option) is not the role of microvilli (cell walls in plants provide rigidity, but these are animal - like cells in the context of absorption in the small intestine). Storing enzymes (fourth option) is not the main function of microvilli; their primary function is to increase the surface area for absorption.

Answer:

It increases the surface area for absorption.