AtomThe smallest part of an element made of protons, neutrons, and electrons. Ex. Carbon (C)MoleculeTwo or more atoms bonded together. Ex. waterOrganelleA small part inside a cell that has a specific job to do. Ex. vacuoleCellThe basic unit of structure and function in a living thing. Ex. white blood cellTissueMany cells of the same type working together to perform a function. Ex.OrganDifferent tissues working together to form a structure with a specific function. Ex. heart
