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Which event made Earth safer for life?

Answer and explanation

Correct answer: Formation of ozone layer

The ozone layer is a protective region of the atmosphere that absorbs much of the Sun’s harmful ultraviolet radiation. Ultraviolet radiation can damage living cells and make survival more difficult. The development of this protective layer therefore made Earth’s surface safer and supported the continuation and spread of life, especially after organisms began living outside water. It was one important environmental change in Earth’s long evolution.

Option B is correct because the formation of the ozone layer reduced exposure to harmful radiation. The disappearance of all oceans would remove an essential habitat and water source, not improve safety. The Moon cannot turn into the Sun, and gravity is necessary for Earth to hold its atmosphere and maintain stable conditions. Thus the ozone layer is the only scientifically suitable choice among the options.

Related tags

Ozone FormationLife SafetyEarth Evolution

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