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28 February, 13:15

10. Living things are made mostly of these four

main elements:

(1) hydrogen, oxygen, nitrogen, and protein

(2) water, protein, carbohydrate, and fat

(3) carbon, hydrogen, oxygen, and nitrogen

(4) glucose, salt, mineral, and base

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Answers (1)
  1. 28 February, 13:26
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    (3) carbon, hydrogen, oxygen, and nitrogen
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