The figure below illustrates how food is transported in phloem tissue. 
At what step(s) during the movement of sugar does the plant provide metabolic energy?
A) steps 2 and 4, when water enters and leaves the phloem
B) step 1, when sugars are loaded into the phloem
C) step 3, when sugar diffuses into respiring cells
D) All of the steps require the expenditure of metabolic energy.
Correct Answer:
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B)
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