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Why is it necessary to link oxygen's role for complex life with both energy and protection?

Answer and explanation

Correct answer: Because oxygen supported efficient energy production and the formation of the ozone layer

The presence of oxygen enabled aerobic respiration, which provides much more energy for complex organisms. Oxygen in the atmosphere also led to the formation of the ozone layer, which absorbs much of the harmful ultraviolet radiation and protects life. Gravity results from Earth's mass, not from oxygen. Exam tip: remember oxygen's evolutionary importance through both aerobic energy production and ozone-based UV protection.

Related tags

Oxygen EvolutionAerobic RespirationOzone LayerComplex LifeEarth EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeography

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