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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.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
the small amount of air that always remains in the lungs during breathing.
a duct through which saliva passes from the salivary gland into the mouth.
the tough connective tissue membrane surrounding bones on the outside. It contains nerves and...
a molecule that is built up of two or more different elements that are chemically joined...