SME
Grade 7 Science · Problem type
The carbon cycle
Use this for “How does carbon get from the air into an animal, and back?”
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Carbon is in the air as carbon dioxide, in living things as sugar and other molecules, in dead matter, in the ocean and in coal and oil.
Assumptions
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Every arrow is carbon moving from one place to another. The same atoms go round and round.
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Photosynthesis takes carbon out of the air; respiration, decomposition and burning put it back.
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The dashed arrow takes millions of years.
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Producer, consumer or decomposer?
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Energy flow and matter cycling in ecosystems
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