Essential Idea: There is an unbroken chain of life from the first cells on Earth to all cells in organisms alive today.
1.5.U1 Cells can only be formed by division of preexisting cells.
1.5.U2 The first cells must have arisen from non-living material.
1.5.U3 The origin of eukaryotic cells can be explained by the endosymbiotic theory.
1.5.A1 Evidence from Pastuer’s experiments that spontaneous generation of cells and organisms does not now occur on Earth.
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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