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that lightning sparked chemical reactions in Earth's early atmosphere. The early atmosphere contained gases such as ammonia, methane, water vapor, and carbon dioxide. Scientists hypothesize
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Scientists are concerns about the loss of species because the loss of one species can set off a chain reaction that cause other species to die out and affect out food chain.
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the cell theory is:
1. all organisms are made of cells
2. all cells are produced by other living cells
3. the cell is the most basic unit of life