HSC Earth And Environmental Science Practice Questions - HSC Earth And Environmental Science (NSW Higher School Certificate, Year 12) Exam

What role did early cyanobacteria play in transforming Earth's early atmosphere?

They produced methane through anaerobic respiration They trapped free nitrogen to form ammonia crusts They emitted sulfur dioxide that cooled the planet They released large volumes of oxygen via photosynthesis

Correct Answer:

They released large volumes of oxygen via photosynthesis

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