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Ocean Oxygenation during Mid-Devonian Enabled Expansion of Animals into Deeper-Water Habitats

Around 390 million years ago (Devonian period), marine animals began colonizing depths previously uninhabited.

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When resources are low, animals often sacrifice reproduction. A recent study in mice finds that a group of brain cells (called melanin-concentrating hormone neurons) controls the response to to diet and the timing of fertility.

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How to Detect Consciousness in People, Animals and Maybe Even AI

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