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13. Instead of calcium, it's phosphorus. 16. Helps regulate temperature; source of H+ ions for making ATP in the electron transport chain in mitochondria 17. polarity and hydrogen bonding; also the fact that, when it freezes, it takes up more space than when it's liquid 18. just hydrogen 19...

What would happen if nothing died? Would natural selection be important? How many new organisms could be born before there was a huge strain on the environment and resources?