| A | B |
|---|
| guard cells | specialized cells that control the opening and closing of the pores on the surface of a leaf |
| homeostasis | the ability of an organism to maintain a stable internal environment even when the external environment changes |
| immune system | the body's primary defense against disease-causing pathogens |
| insulin | a hormone that prompts glucose to move from the blood into body cells, resulting in a lower glucose level in the bloos |
| microbe | any microscopic organism |
| mitochondria | the organelles that are the powerplant of the cell; makes energy |
| pancreas | an endocrine organ that secretes insulin |
| parasite | an organism that survives by living and feeding on other organisms |
