Multicellular organisms are organised into increasingly complex parts. , In order, from least complex to most complex these are, cells, tissues, organs, organ systems, organisms., A tissue is made from a group of cells with a similar structure and function working together to do a particular job., Some examples of tissues include muscles tissue to cause movement in animals and xylem tissue to carry water in plants., An organ is made from a group of different tissues, which all work together to do a particular job., Some examples of organs include the heart to pump blood around the body, the lungs to oxygenate the blood and leaves for photosynthesis in plants., An organ system is made from a group of different organs, which all work together to do a particular job., A good example of an organ system is the digestive system with organs like the stomach, intestines and liver working together to break down food.,

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