| A | B |
|---|
| host | The organism that a parasite lives in or on in a parasitism interaction |
| parasite | The organism that benefits by living on or in a host in a parasitism interaction |
| parasitism | A relationship in which one organism lives on or in a host and harms it |
| carrying capacity | The largest population that an area can support |
| limiting factor | An environmental factor that causes a population to decrease |
| population density | The number of individuals in a specific area |
| ecology | The number of individuals in a specific area |
| ecosystem | The community of organisms that live in a particular area along with their nonliving surroundings |
| community | All the different populations that live together in an area |
| secondary succession | The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist. |
| pioneer species | The first species to populate an area |
| commensalism | A relationship between two species in which one species benefits and the other is neither helped nor harmed |
| mutualism | A relationship between two species in which both species benefit |
| symbiosis | A close relationship between two species that benefits at least one of the species |
| emigration | Leaving a population |
| immagration | Moving into a population |
| population | All the members of one species in a particular area |
| species | A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce |
| photosynthesis | The process in which organisms use water along with sunlight and carbon dioxide to make their own food |
| primary succession | The series of changes that occur in an area where no soil or organisms exist |
