Examlex
The U.S.Constitution prevents tariffs on trade between the individual states.
Xylem
The vascular tissue in plants responsible for the transport of water and nutrients from the roots to the rest of the plant.
Phloem
The vascular tissue in plants responsible for the transport of nutrients such as sugars from the leaves to other parts of the plant.
Annual Rings
Concentric rings visible in the cross-section of a tree trunk representing a year's worth of growth; used to estimate age and historical climate conditions.
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