Answer:
identify the variables
Explanation:
control:type of lemon used
dependent:whether apple slice turns brown at pH>2
independent:pH value
C. A lipid
It's because lipids include glycerol and fatty acids.
Absorption takes place in the small intestine. Fatty acids and glycerol are formed by digestion of lipids which diffuse through the one-cell thick cell wall of villi and into lacteals (lymphatic vessels).
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