levels of organization

• all living things are made up of cells
• cells are the smallest part and the basic building blocks of all living things
• tissues are made up of groups of similar cells
• tissues work together and perform a function
• organs are made up by the union of several tissues that are organized and work together
• an organ system is a group of organs with related functions
• organ systems work together to perform body functions
• organisms are living things
• living things can carry out the vital functions