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a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva and the bacteria that convert food into acids.
the splitting of water molecules into oxygen atoms and energy-rich hydrogen atoms to be used in...
a large combination of RNA and protein which catalyses the formation or synthesis of proteins ...
a biological membrane that separates the interior of all cells from the outside environment.
when a plant cell loses water and the cell membrane pulls away from cell wall.
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....