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<p><a href="page.php?w=amino_acid">amino acid</a>s, and <a href="page.php?w=sugar">sugar</a>s, likely formed by reactions in the environment. A successful theory of the origin of life must explain how all these chemicals came into being.</p>

<p><big> Pre-1960s conceptual history </big></p>
<p><big> Spontaneous generation </big></p>
<p>One ancient view of the origin of life, from <a href="page.php?w=Aristotle%27s_biology">Aristotle</a> until the 19th century, was of <a href="page.php?w=spontaneous_generation">spontaneous generation</a>. This held that "lower" animals</p><p>
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