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narrow external opening to the gill chamber.
(also called primary meristems) meristems at the apex (tip) of stems and roots where primary...
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
the complete set of alleles (different forms of genes) making up the genetic material of a...
the membrane surrounding the vacuole. It is similar in structure and function to the cell...