| A | B |
|---|
| cell | the smallest living unit that is able to perform the basic functions of life |
| tissue | a group of cells that work together |
| organ | 2 or more types of tissue that work together to perform a function |
| photosynthesis | the process plants use to capture energy from sunlight and convert it to chemical energy |
| cellular respiration | the process in which cells use oxygen to release energy stored in sugars |
| stimulus | something that produces a response from an organism |
| behavior | an organism's action in response to a stimulus |
| adaptation | a characteristic, behavior, or inherited trait that makes a species able to survive & reproduce in a particular environment |
| characteristic | a trait, attribute, or distinguishing feature |
| structure | the framework of something; how it is put together |
| function | the natural action of something; how it works |
| invertebrate | an animal that does not have a backbone |
| vertebrate | an animal that has a backbone |
| exoskeleton | a strong outer covering made of chitin that protects cells, tissues, and organs |
| endoskeleton | an internal support system that grows as the animal grows |
| ectotherm | a cold-blooded animal whose body temperature changes with the environment |
| endotherm | a warm-blooded animal that maintains a constant body temperature |
| amphibian | a cold-blooded vertebrate that lives in water & uses gills as a baby then moves onto land & uses lungs as an adult |
| reptile | a cold-blooded vertebrate that has skin covered with scales and has lungs |
| mammal | a warm-blooded vertebrate that has hair; females give birth to live young and produce milk |
