Multiple choice

Which of the following was the first organisms to show oxygenic photosynthesis?

  1. Photosynthetic bacteria

  2. Chemosynthetic bacteria

  3. Green algae

  4. Cyanobacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  Cyanobacteria was the first organisms to show oxygenic photosynthesis.Photoautotrophic, oxygen-producing cyanobacteria created the conditions in the planet's early atmosphere that directed the evolution of aerobic metabolism and eukaryotic photosynthesis.

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