| Definition | Term |
| Behaviors and physical characteristics that allow organisms to live successfully in their environments | |
| Organism that is killed and eaten as food | |
| A symbiotic relationship in which one organism benefits and the other is harmed | |
| Any relationship in which two species live closely together and at least one of the species benefits | |
| A symbiotic relationship in which one species benefits and the other species is neither helped nor harmed | |
| A group of organisms that can mate with each other and produce offspring that can also mate and reproduce | |
| Organism that kills other organisms for food | |
| The living parts of a habitat | |
| All the different populations that live together in an area | |
| If death rate > birth rate, population size will _____. (increase or decrease) | |
| Organism that is harmed in a parasitic relationship | |
| A living thing | |
| The study of how organisms interact with each other and with their environment | |
| The community of organisms that live in a particular area, along with their nonliving environment | |