The Primary Source of Oxygen for the Earth's Atmosphere During

question 23

Multiple Choice

The primary source of oxygen for the earth's atmosphere during the past half billion years or so appears to be

• A) volcanic eruptions.
• B) photosynthesis.
• C) photodissociation.
• D) exhalations of animal life.
• E) transpiration.

---

Definitions:

Productive Results

Outcomes or achievements that significantly contribute to the goals or objectives of a project or organization.

Controversial Items

Topics or matters that provoke debate or disagreement among people.

Fossil Fuel Depletion

The gradual exhaustion of non-renewable energy sources like coal, oil, and natural gas.

Virtual Meetings

Online gatherings where participants interact through video, audio, and text communication platforms, often used for business, education, and social purposes.