Microscopic algae in the oceans contribute to life on Earth by:
AEating other organisms
BForming clouds
CReleasing most of the oxygen we breathe
DReleasing toxic gases
Answer & Solution
Correct answer: C. Releasing most of the oxygen we breathe
Marine phytoplankton (microscopic algae) produce roughly 50-80% of the oxygen on Earth through photosynthesis. So the oxygen in EVERY breath you take comes more from the ocean's microbes than from forests. They are the foundation of the marine food chain and key climate regulators.
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