Why Could Life Not Have Existed on Land Any Earlier

question 14

Multiple Choice

Why could life not have existed on land any earlier than 475 million years ago?

• A) The temperature was too high.
• B) There was too little sunlight.
• C) There was too little oxygen in the atmosphere.
• D) Earth was covered in erupting volcanoes.
• E) There was no land because Earth was covered in water.

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