Carbon and Oxygen are elements and are_____________to life

Oxygen lives in the atmosphere as a __________.

Carbon and Oxygen are constantly being recirculated between air, water, and _______________.

Atmospheric oxygen comes mostly from _____________.

During the process, ___________________, plants use carbon dioxide from the air and turn it into oxygen.

Carbon dioxide is produced through the ________________of animals.

The process of living things decomposition releases ___________back into the air, or atmosphere.

Humans are disrupting the processes of nature. We are releasing too much carbon into the _____________.

Plants and animals work ______________to balance the oxygen and carbon cycles.

We, humans, are stressing the processes of nature, and therefore our future, when we cut down too many trees to build cities or housing.

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