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In what order would the buildingblocks of life on earth need to come about to sustain life on earth?

If you were in a science class and for the final exam had to describe in six brief paragraphs (600 words) what conditions must be present for life to exist on earth and in what order, what would you write? For instance, we have sun and moon, atmosphere, matter and energy, water, plant life, animal life, in what order would these need to come to be for life to be sustainable on earth?

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