1) Is a circulation of oxygen in various forms through nature. a) Oxygen Cycle b) Nutrients Cycle c) Carbon Cycle 2) The atmosphere contains about _____ oxygen. a) 20% b) 22% c) 21% 3) Is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. a) Photosynthesis b) Photoshyntesis c) Photosyntesis 4) Oxygen enters organisms only through ________ and leaves through photosynthesis a) Reparation b) Respiration c) Resperation 5) Are atoms and molecules that organisms obtain from their environment as food in their quest for survival and therefore growth in population. a) Energy b) Nutrients c) Oxygen

Environmental Science

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