The ability to cause change.

An organism that uses an outside energy source, such as the Sun, and produces its own food.

A series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen.

An organism that cannot make its own food and gets energy by eating other organisms.

Consumers that only eat plants.

Consumers that only eat animals.

Consumers that eat both plants and animals.

Consumers that eat the remains of organisms.

Consumers that break down organic wastes or dead organisms and return unused nutrients and matter back into the soil for producers to use.

A model that shows how energy flows in an ecosystem through feeding relationships.

A model of energy transfer that can show how the food chains in a community are connected.

A model that shows the amount of energy available in each link (level) of a food chain.

The idea that only 10% of food energy is passed from one trophic level to the next.

Anything that has mass and takes up space.

The process of a liquid changing to a gas at the surface of the liquid.

The process by which plants release water vapor through their leaves into the atmosphere.

The process by which a gas changes to a liquid.

Water, in liquid or solid form, that falls from the atmosphere.

The breaking down of dead organisms and organic waste.

The process that changes atmospheric nitrogen into nitrogen compounds that are usable by living things.