Students cutout arrows and pictures and arrange them into a puzzle to explain the carbon cycle. Hints and answers key supplied.
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Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment. Emphasis is on the idea that matter that is not food (air, water, decomposed materials in soil) is changed by plants into matter that is food. Examples of systems could include organisms, ecosystems, and the Earth. Assessment does not include molecular explanations.