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BiologyWise
Biology Wise: Carbon Cycle Diagram
Explains what the carbon cycle is and the basic steps in the cycle.
BiologyWise
Biology Wise: An Easy Explanation of the Carbon Cycle for Kids
The importance of the carbon cycle, how it works, the sources of carbon, and the steps in the carbon cycle are explained here.
Morning Earth
How Life Works: Biosphere Is Process: Animal & Plant Gas Exchange
Scholars explore the biology concept of the oxygen cycle. The tutorial consists of definitions and pictures about animal and plant gas exchange.