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Cycles of Matter pp. 104, 105

Horizontales
Oxygen helps animals and people break down __ and get energy from it.
Decomposers __ nitrogen back into the soil when plants and animals die.
This important substance is found in the soil and the air.
Verticales
Carbon dioxide and oxygen are both found in the __.
Humans and animals breathe in this important gas.
Animals get the nitrogen they need by __ plants or other animals.
___ use carbon dioxide to make food.