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a complex chemical compound that fills the spaces in the cell wall between cellulose, hemicellulose, and pectin components, especially in tracheid, sclereid and other xylem cells. This makes the cell walls hard, woody and waterproof.
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
(also called elimination or defecation) the process whereby undigested food remains are expelled...
an infectious disease of the digestive system that is characterised by diarrhoeaandbloodinthe...