Based on the "compare" wording of the question, I am assuming that the answer should provide more similarities than differences between the vascular system of plants and the circulatory system of humans. Both systems are similar in that they are both made up of a vast array of tubes. Humans have arteries, capillaries, and veins to move materials through the system, and plants have xylem and phloem to do the same thing. Both systems are moving a combination of liquids and solids. The liquid part of the blood is plasma, and the liquid in plants will be water. As for the solid part, both systems carry a variety of solutes throughout the organism. One big difference is in how each organism moves materials through the tubes. Humans have a heart that pumps the materials throughout the body; however, transpiration is used in plants to move water up the xylem.
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