Answer:
Its internal volume enlarges and the cell membrane expands
Explanation:
A contour interval is the lines on a topographic map that state the height (from sea level) of the hill, valley, mountain or the ground level.
Metabolism, respiration and digestion are all complex chemical processes involving many steps, happening in 3 dimensional space within cells. Metabolism is the breaking of bonds within food molecules (like sugar) to harness energy for cellular work; respiration involves moving oxygen and carbon dioxide gases between cells to facilitate cellular metabolism and digestion involves breaking down food macro structures into smaller units suitable for metabolism.
So the answer is D - each of the three process involve multiple chemical reactions.
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