Directions: Fill in the blanks to complete the statement. Write your answers on separate sheet of paper. 1. Respiration, and decomposition are three other ways that CO₂ and/or oxygen is released back into the atmosphere. 2. The water cycle, also known as the _describes the continuous from the movement of water on, above and below the surface of the Earth. 3. When solar energy warms the Earth's surface, water oceans, rivers, lakes and land. 4. Organisms use and produce gases in photosynthesis and 5. During respiration, plants use and produce carbon dioxide. 6. Cellular respiration is the process by which animals take in sugars and oxygen and emit water and energy. 7. In nitrogen assimilation, plants finally consume the nitrates made by soil bacteria and use them to make nucleotides, and other vital chemicals for life. 8. The nitrogen cycle refers to the cycle of atoms through the living and non-living systems of Earth. 9. Ammonia may be converted back into atmospheric nitrogen through the process of 10. During ammonification process, the decomposers break down amino acids and nucleic acids into nitrates and and release those compounds back into the soil.​