Match the following terms and definitions. 1. the high energy chemical compound with three phosphate groups that provides energy for all other cell activities exocytosis 2. chemical reactions in plants and animals that break down food molecules into energy (atp) hypertonic 3. movement of particles or molecules from higher concentration to lower concentration cellular respiration 4. when cells engulf or ingest substances homeostasis 5. when cells expel or get rid of substances from within diffusion 6. the relatively constant state in the internal environment of an organism adenosine triphosphate (atp) 7. a solution that has a higher salt concentration than the salt endocytosis