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found in the cell wall of xylem cells where the secondary cell wall is absent but the primary cell wall is present. They allow lateral movement of water within the plant.
the sequence of events relating to the flow of blood or blood pressure in the heart that occurs...
an allergic reaction that triggers the immune system causing constriction and inflammation of...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
sharp-edged modified last upper premolar and the first molar in carnivores adapted to shear or...