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Questions and Answers
What percentage of Earth's atmosphere is composed of nitrogen?
What do most organisms use oxygen for?
What is an atmosphere?
What do plants, algae, and cyanobacteria use carbon dioxide for?
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What is the primary factor that allows a planet to retain an atmosphere?
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Study Notes
Earth's Atmosphere Composition
- Nitrogen makes up approximately 78% of Earth's atmosphere.
Oxygen Usage in Organisms
- Most organisms utilize oxygen for cellular respiration, a process that converts nutrients into energy.
Definition of Atmosphere
- An atmosphere is a layer of gases surrounding a planet, held in place by gravity. It plays a crucial role in supporting life and regulating temperature.
Carbon Dioxide Utilization by Photosynthetic Organisms
- Plants, algae, and cyanobacteria use carbon dioxide during photosynthesis to produce glucose and oxygen, essential for their growth and energy needs.
Retention of Atmosphere on a Planet
- The primary factor that allows a planet to retain an atmosphere is its gravitational pull, which holds gases close to the planet's surface and prevents them from escaping into space.
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Description
Test your knowledge of planetary and stellar atmospheres with this quiz. Explore the layers of gases that envelop planets and stars, and learn about the factors that influence their composition and stability.
