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Describes species, population, community, ecosystem, and biosphere as the levels of ecological organization.
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| organism | living thing |
| biotic factor | living, or once living thing(s) |
| species | group of organisms that can mate with each other and produce offspring that can also mate and reproduce |
| community | all the different populations that live together in an area |
| ecology | the study of how organisms interact with each other and their environment |
| habitat | an environment that provides the things an organism needs to live, grow, and reproduce |
| abiotic factor | nonliving thing(s) |
| population | all the members of one species living in a particular area |
| ecosystem | a community of organisms that live in a particular area, along with their nonliving environment |
| birth rate | number of births per 1,000 individuals for a given time period |
| death rate | number of deaths per 1,000 individuals for a given time period |
| immigration | moving into a population |
| emigration | leaving a population |
| population density | the number of individuals in an area of a specific size |
| limiting factor | an environmental factor that causes a population to stop growing or decrease in size |
| carrying capacity | the largest population that an area can support |
| natural selection | a characteristic that makes an individual better suited to a specific environment through a process |
| niche | the role of an organism in its habitat |
| adaptation | the behaviors and physical characteristics that allow organisms to live successfully in their environment |
| competition | the struggle between organisms to survive as they attempt to use the same limited resources |
| predation | an interaction in which one organims kills another for food or nutrients |
| predator | the organism that does the killing |
| prey | the organism that is killed |
| symbiosis | any relationship in which two species live closely together and at least one of the species benefits |
| mutualism | a relationship in which both species benefit |
| commensalism | a relationship in which one species benefits and the other species is neither helped nor harmed |
| parasitism | a relationship that involves one organism living with, on, or inside another organism and harming it |
| parasite | the organism that benefits for parasitism |
| host | the organism it lives on or in |
| succession | the series of predictable changes that occur in a community over time |
| primary succession | the series of changes that occur in an area where no soil or organisms exist |
| pioneer species | the first species to populate 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 |
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What is all the different populations that live together in an area called?
Community: A biological community consists of all the populations of different species that live in a given area.
What is the term used to describe all of the populations of all the species of living organisms within a particular habitat?
Ecosystem: The collection of all living organisms in a geographic area, together with all the living and non-living things with which they interact.
What is the term used to describe all of the living and nonliving things that interact in an area?
An ecosystem is a community made up of living and nonliving things interacting with each other. Nonliving things do not grow, need food, or reproduce. Some examples of important nonliving things in an ecosystem are sunlight, water, air, wind, and rocks. Living things grow, change, produce waste, reproduce, and die.