An organism that can make its own food.
An organism that obtains energy by feeding on other organisms.
A consumer that eats only plants.
A consumer that eats only animals.
A consumer that eats both plants and animals.
A carnivore that feeds on the bodies of dead organisms.
An organism that breaks down wastes and dead organisms.
A series of events in which one organism eats another and obtains energy.
The pattern of 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.
The continuous process by which water moves from Earth's surface to the atmosphere and back.
The process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state.
The process by which a gas changes to a liquid.
Rain, snow, sleet, or hail.
The process of changing free nitrogen gas into a usable form.
The study of where organisms live.
The very slow motion of the continents.
The movement of organisms from one place to another.
Species that are carried to a new location by people.
The typical weather pattern in an area over a long period of time.
A group of land ecosystems with similar climates and organisms.
A leafy roof formed by tall trees.
A layer of shorter plants that grow in the shade of a forest canopy.
An area that receives less than 25 centimeters of precipitation per year.
An area populated by grasses and other nonwoody plants. Most grasslands get 25 to 75 centimeters of rain each year.
A grassland close to the equator that receives as much as 120 centimeters of rain per year.
A tree that sheds its leaves and grows new ones each year.
A tree that produces its seeds in cones and that has needle-shaped leaves.
An extremely cold, dry biome.
Soil that is frozen all year.
A habitat in which the fresh water of a river meets the salt water of the ocean.
The area between the highest hightide line and lowest low-tide line.
The region of shallow ocean water over the continental shelf.