Q.

Maximum oxygen is available from –

A. Deserts
B. Green forests
C. Grass lands
D. Phytoplanktons
Answer» D. Phytoplanktons
Explanation: Most of Earth's oxygen comes from tiny ocean plants - called phytoplankton - that live near the water's surface and drift with the currents. Like all plants, they photosynthesize - that is, they use sun-light and carbon dioxide to make food. Scientists believe that phytoplankton contribute between 50 to 85 percent of the oxygen in Earth's atinctspbere (National Geographic)
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