principles of organisation

• what are cells?

  cells are the basic building blocks of all living organisms
• what is a tissue?

  a tissue is a group of cells with a similar structure and function
• what are organs?

  organs are aggregations of tissues performing specific functions
• how are organs organised?

  organs are organised into organ systems which work together to form organisms
• what are the 5 levels of cell organisation in order?

  cells -> tissues -> organs -> organ systems -> living organisms