Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

A reason why early living organisms on Earth could not have survived on the surface was because the lack of an ozone layer. The answer is number 1.

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b. climate change will cause an increase in biodiversity of all ecosystems.

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