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the hormone that stimulates the secretion of pancreatic juice.
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
the nerve cells that transmit nerve impulses towards the central nervous system from the...
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.
epithelial tissue consisting of a single layer of cells.