alleryMicroscopic 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.
Keep practising Diversity in Living Organisms
Browse all Diversity in Living Organisms questions for CBSE Class 9, or explore more Science topics.
Related questions
Match each animal phylum with its distinctive anatomical feature:Match each seed-bearing plant division with its reproductive trait:Match each plant kingdom division with its botanical hallmark:Match each of Whittaker's Five Kingdoms with its defining organism:Diversity bingoSpot the odd one outComplete the naming ruleClassification numbers