stem cell - Unspecialised cell that are capable of dividing into cells that can develop into different cell types, tissue - A group of similar cells carrying out the same function, specialised cell - Description of a cell that has become differentiated to carry out a particular function, system - A group of organs that work together to carry out a particular function, e.g. circulatory, respiratory and digestive, organ - A group of tissues that work together to carry out a particular function e.g. heart and lungs,

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