period of time during which human activities have impacted the environment enough to constitute a distinct geological change.
species at the top of the food chain, with no predators of its own. Also called an alpha predator or top predator.
having to do with water.
all the different kinds of living organisms within a given area.
area of the planet which can be classified according to the plant and animal life in it.
ecological phenomenon in which a producer or primary consumer is removed from the environment.
series of events where the previous event causes the next event.
member of a country, state, or town who shares responsibilities for the area and benefits from being a member.
all weather conditions for a given location over a period of time.
management of a natural resource to prevent exploitation, destruction, or neglect.
study of Earth's biodiversity, with the goal of protecting species, habitats, and ecosystems. Also called conservation biology.
organism on the food chain that depends on autotrophs (producers) or other consumers for food, nutrition, and energy.
organism that breaks down dead organic material.
area of land that receives no more than 25 centimeters (10 inches) of precipitation a year.
any natural or human-induced factor that directly or indirectly sets a change to an ecosystem in motion.
branch of biology that studies the relationship between living organisms and their environment.
community and interactions of living and nonliving things in an area.
organism threatened with extinction.
particular period of time in history marked by an event that begins a new period.
no longer existing.
process of complete disappearance of a species from Earth.
group of organisms linked in order of the food they eat, from producers to consumers, and from prey, predators, scavengers, and decomposers.
ecosystem filled with trees and underbrush.
ecosystem with large, flat areas of grasses.
idea that the number of herbivores must be controlled by both the bottom up and the top down for producers, plant life, to survive.
environment where an organism lives throughout the year or for shorter periods of time.
having to do with the present geological time period. The Holocene Epoch began at the end of the last glacial period, about 10,000 years ago.
organism that has a major influence on the way its ecosystem works.
extinction event in which a large number of species go extinct in a relatively short period of time.
an event occurring naturally that has large-scale effects on the environment and people, such as a volcano, earthquake, or hurricane.
last geologic period of the Paleozoic Era.
animal that hunts other animals for food.
animal that is hunted and eaten by other animals.
organism on the food chain that can produce its own energy and nutrients. Also called an autotroph.
course of actions, beliefs, and laws taken by a government having to do with a specific issue or concern.
organism that eats dead or rotting biomass, such as animal flesh or plant material.
group of similar organisms that can reproduce with each other.
responsible management to ensure benefits are passed on to future generations.
ecological phenomenon in which a top predator is removed from the environment.
ecological phenomenon triggered by the addition or removal of predators from an environment.
cold, treeless region in Arctic and Antarctic climates.