The first ocean lifeforms were microscopic, so small they would be invisible to the naked eye. Indeed, life had been evolving and changing for more than 3 billion years-the majority of the planet's existence-before the first creatures made their way out of the water. As terrestrial creatures, humans are largely unaware that much of life's history has taken place in the ocean. The ocean may seem like a vast and unchanging landscape, but the reality is that the world beneath the waves has continuously evolved over time.
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