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vascular tissue that conducts food substances from the leaves to other parts of the plant. The cells are living with perforated end plates.
broad group (taxon) in the biological classification system, which is then divided into kingdoms...
the dramatic increase in the human population growth rate over the past two centuries.
a small finger-like blind-ending extension of the mammalian large intestine connected to the...
(also called selectively permeable membrane) a membrane which allows some substances to cross it...