nerve cells - pass message from brain to any part of your body., potassium - the symbol is K, pressure= - force divided by area., sodium - the symbol is Na, physical changes - a change that can be reversed, chemical change - a change that can not be reversed, exothermic - energy goes out and it gets hotter, endothermic - energy goes in and it gets colder, filtration - an action to make the bigger particle seperate from the small bits., residue - the solid that is left after filtering., conduction - a way of energy moving, evaporation - the change of state from liquid to gas, unit of measurement for power - watts (W), non-renewable - runs out, waves - an oscillations that transfers energy from one place to another without transferring matter,

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