1.5.U1 Cells can only be formed by division of preexisting cells.
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1.5.U2 The first cells must have arisen from non-living material.
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1.5.U3 The origin of eukaryotic cells can be explained by the endosymbiotic theory.
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1.5.A1 Evidence from Pastuer’s experiments that spontaneous generation of cells and organisms does not now occur on Earth.
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1.5.NOS Testing the general principles that underline the natural world- the principles that cells only come from pre-existing cells needs to be verified.
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