| A | B |
|---|
| organism | a living thing that can carry out life's processes independently |
| tissue | a group of similar cells that perform the same function |
| organ | a collection of tissues that carryout a specialized function of the body |
| organ system | a group of organs that work together to perform body functions |
| leaf | a plant organ that is the main site of photosynthesis and transpiration |
| root | the mainly underground organ of vascular plants that holds plants in place and absorbs water and minerals from the soil |
| stem | a plant structure that provides support and transports nutrients |
| digestive system | the organs that break down food so that it can be used by the body |
| excretory system | the organs that collect and eliminate nitrogenous wastes and excess water from the body |
| respiratory system | a collection of organs whose function is to take in oxygen and expel carbon dioxide |
| circulatory system | the body system made up of the heart, the blood vessels, and the blood |
| muscular system | the organ system whose primary function is movement and flexibility |
| nervous system | the organs that control the actions and reactions and reactions of the body in response to stimuli from the body |
| homeostasis | the maintenance of a constant internal state in a changing environment |
| sensory receptor | a specialized structure that contains the ends of sensory neurons and that responds to specific type of stimuli |
| behavior | an action that an individual carries out in response to a stimulus or the environment |
| memory | the ability to store and recall past experience |
| stomata | openings on the underside of a leaf that allow carbon dioxide in and oxygen out |
| chloroplast | organelles in a plant cell that capture energy from sunlight and change it into food for the plant to use |
