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Across
  1. 4. Photosynthesis that creates oxygen is known specifically as _______ photosynthesis
  2. 7. The enzyme responsible for catalyzing nitrogen fixation
  3. 8. The process by which current plants synthesize food
  4. 9. Turning atmospheric nitrogen into biological nitrogen is known as Nitrogen _______
Down
  1. 1. Resembling a sphere; spherical in shape
  2. 2. An organism that can perform both oxygenic and anoxygenic photosynthesis
  3. 3. Rather than DNA, early life mostly likely used ___
  4. 5. The color of haze that a methane-rich atmosphere would have
  5. 6. An abiotic source of fixed nitrogen
  6. 10. The most abundant element in the atmosphere