rinozeraioxp9qe rinozeraioxp9qe
  • 12-10-2017
  • Biology
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explain why the emergence of alga was required before animals could exist on the planet

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kirkmer03
kirkmer03 kirkmer03
  • 12-10-2017
Because the sun was a deadly laser. The ozone layer didn't exist yet, so the sun produced too much radiation for life above the water to possible. 
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