| A | B |
|---|
| Biotic factors | living parts of an environment |
| Abiotic factors | nonliving parts of an environment |
| Species | a group of organisms of the same kind that produce offspring that can reproduce |
| Population | all the members of a particular species that live within a given area |
| Community | all the different populations that live within a given area |
| Limiting factors | conditions that limit the size of a population within an environment |
| Carrying capacity | the number of individuals of a given species that can be supported by an ecosystem |
| Symbiosis | a relationship between different species living in close permanent association |
| Mutualism | a symbiotic relationship in which both species benefit |
| Commensalism | a symbiotic relationship in which one species benefits while the other is not affected |
| Parasitism | a symbiotic relationship in which one species benefits |
| Parasite | the organism that benefits from a parasitic relationship |
| Host | the organism that is harmed from a parasitic relationship |
| Brood | a group of birds hatched at the same time and cared for by the same mother |
| Extinct | species that no longer exist |
| Ozone layer | a region in the atmosphere that contains a large concentration of ozone gas that blocks most ultraviolet radiation from the sun |
| Ultraviolet rays | high-energy radiation from the sun that has been linked to skin cancer |
