Which of the following is responsible for largest amount of oxygen on earth?
Correct answer: B. Algae
- A. Peat bogs
- B. Algae
- C. Trees
- D. None of these
Explanation
Marine algae and microscopic phytoplankton carry out enormous amounts of photosynthesis and produce roughly half of Earth’s oxygen. Trees contribute oxygen, but they are not the largest overall source.
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Environmental science covers ecosystems, food chains and webs, energy flow, biogeochemical cycles, biodiversity, natural resources and population effects. Atmospheric study includes the layers and composition of air, weather and climate, greenhouse gases, global warming, ozone depletion, acid rain and pollution, with climate change distinguished from ordinary weather variation.
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