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(also called physical digestion) the breaking down of food into smaller pieces using mechanical (physical) means, e.g. chewing and peristalsis.
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
process by which cells become specialised to perform a specific function.
the spontaneous, passive movement of water molecules from an area of higher water concentration...
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...