Answer:
The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves. The phloem carries food downward from the leaves to the roots. Xylem cells constitute the major part of a mature woody stem or root.
Explanation:
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Efficiency is completing a task as fast a possible the the least amount of effort.
This could be wrong but I am giving a decent suggestion: All ions are atoms with a negative charge.
E = MC^2. Albert Einstein's proven formula. When mass travels at the square of speed of light, the mass gets converted into energy
