3 is C i believe, and as for 4 minerals are solid, natural.. that's about all I can say...
Answer:
Oxygen.
Explanation:
They take in oxygen from the air. This is the process of respiration.
Answer:
first we need to convert everything in SI units
I'm not sure I'm sorry for that but I found this http://www.chem4kids.com/files/atom_ions.html
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