Cycles Worksheet

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Our atmosphere is ____% nitrogen gas

78

Plants release 430-470 billion tons of oxygen during the process of ________.

Photosynthesis

Plants use CO2 in the process of _______ to make _______ and _______.

Photosynthesis/Sugar/Oxygen

Animals use oxygen in the process of _______ to make more CO2

Respiration

Oxygen is vital for _______ by animals, a process which produces CO2 and water

Respiration


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