How did the scientist Marcello Malpighi,in 1679,discover the role of phloem?
A) He observed aphids and cut off their beaks.
B) He was an early researcher on the cause of maple sap flow in producing syrup.
C) He observed the effects of girdling a tree below the level of the majority of leaves.
D) He used radioactive tracers to measure the flow of sap between two distances over time.
E) He observed the uptake of ink into the stem of celery.
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