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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.
is the passing of traits to the offspring from its parents or ancestors. The study of heredity...
blood that has no antibodies (blood group AB) and can receive any type of blood.
inflammation of the lining of the bronchi and bronchiole causing them to become clogged with...
organisms that are unable to produce their own organic food and must therefore obtain nutrients...