If you want a happy, healthy and long life you will need all your internal Organs to function properly. An organ is any distinct part of a human or animal or plant that has a characteristic shape and structure and performs a particular function in the organism's life.
The most important organ of the human or animal is the heart. The most important organ of a plant is the root. Several organs function together as an organ system. They need each other in order to work properly.
This worksheet comes from the linked workbook and has this assignment and lots of other fun science worksheets related to the science names projects.