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Many scientific explanations of the origin of life on Earth hold that most early organisms relied on four chemical elements: hydrogen, oxygen, carbon, and nitrogen. Which of these elements most likely increased after the origin of life, allowing more complex organisms to arise and diversify?

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Many scientific explanations of the origin of life on Earth hold that most early organisms relied on four chemical elements: hydrogen, oxygen, carbon, and nitrogen. Which of these elements most likely increased after the origin of life, allowing more complex organisms to arise and diversify?​

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Many scientific explanations of the origin of life on Earth hold that most early organisms relied on four chemical elements: hydrogen, oxygen, carbon, and nitrogen. Which of these elements most likely increased after the origin of life, allowing more complex organisms to arise and diversify?