If every ship on the planet were hauled out of the water, how much would global sea levels change, and how quickly? How different would Earth be if anaerobic life were the only life form, and could it have become sentient?

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If every ship on the planet were hauled out of the water, how much would global sea levels change, and how quickly?
Stacey Gambrill
Westgate-on-Sea, Kent, UK

Science Photo Library/Alamy
How different would Earth be if anaerobic life were the only life form, and could it have become sentient?
Dom Castner
Bellingham, Washington, US
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