Carbon enters the living parts of an ecosystem though the form of

_____________ is an element found in every living thing on Earth

After an animal eats a plant, the animal then breaks down the carbon compounds in a process called

The remains of plants and animals that have been slowly decaying for millions of years turn into something called

Plants are able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and _______ in photosynthesis.

plants breathe in _______________ and breathe out oxygen

The movement of nitrogen through the ecosystem is called the

The algae in the oceans and other water bodies replace about _____ % of all oxygen used on our planet

Oxygen in the water is known as

Oxygen is created in plants and used by

Nitrogen makes up about ___% of the air in the atmosphere.

The process by which bacteria turn nitrogen gas into nitrogen, which plants can use, is called

Plants are involved in one half, and animals in the other half of the

Oceans also play a key role in the

bacteria play an important role in the

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen

A drought in a grassland ecosystem would not affect the wolves because they do not need plants to survive

Without bacteria, nitrogen could still enter living things or be returned to the environment

Nitrogen in the atmosphere is already in the form that plants and animals can use.

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