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Proposed that slow-acting geological forces shaped the planet and it is millions of years old.
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Predicted that left unchecked, the human population will grow beyond the space and food needed to sustain it.
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Published his hypotheses of the inheritance of acquired traits.
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Set sail on teh HMS Beagle.
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Explained that over long periods, the same processes affecting Earth today have shaped Earth's ancient geological features.
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Wrote to Darwin, speculating on evolution by natural selection, based on his studies of the distribution of plants and animals.
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Publishes On the Origin of Species.
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