All the living and nonliving things that interact in a particular area.
The place where an organism lives and that provides the things the organism needs.
The living parts of an ecosystem.
The nonliving parts of an ecosystem.
All the members of one species in a particular area.
All the different populations that live together in an area.
Moving into a population.
Leaving a population.
An environmental factor that prevents a population from increasing.
The largest population that an environment can support.
An organism's particular role, or how it makes its living.
The struggle between organisms to survive in a habitat with limited resources.
An interaction in which one organism hunts and kills another for food.
The organism that does the killing.
The organism that is caught and killed.
A close relationship between two species that benefits at least one of the species.
A relationship in which both species benefit.
A relationship in which one species benefits and the other species is neither helped nor harmed.
Involves one organism living on or inside another organism and harming it.
The organism that lives on or inside another organism and harms it. This organism benefits in parasitism.
The organism the parasite lives on or in.
An organism that can make its own food.
An organism that obtains energy by feeding on other organisms.
Consumers that eat only plants.
Consumers that eat only animals.
A consumer that eats both plants and animals.
A carnivore that feeds on the bodies of dead organisms.
Organisms that break down wastes and dead organisms and return the raw materials to the environment.
A series of events in which one organism eats another and obtain energy.
Consists of many overlapping food chains in an ecosystem.
A diagram that shows the amount of energy that moves from one feeding level to another in a food web.
A group of ecosystems with similar climates and organisms.
An area that receives less than 25 centimeters of rain per year.
Receives between 25 and 75 centimeters of rain each year, and is typically populated by grasses and other non-woody plants.
Grasslands that are located closer to the equator than prairies and receive as much as 120 centimeters of rain each year.
Shed their leaves and grow new ones each year.
Produce their seeds in cones and have leaves shaped like needles.
Extremely cold, dry, land biome.
Rivers, ponds, lakes, and streams.
Found where the fresh water of a river meets the salt water of the ocean.
Natural resources that are naturally replaced in a relatively short time.
Natural resources that are not replaced as they are used.
Any change to the environment that has a negative effect on living things.
The number of different species in an area.
Species in danger of becoming extinct in the near future.
Species that could become endangered in the near future.
The disappearance of all members of a species from Earth.