Answer:
B
Explanation:
Coal is a non-renewable resource, so the supply can't produce faster than we can mine it.
Answer:
people with breathing problems such as severe asthma.
Explanation:
Heliox is a medical treatment for patients with difficulty breathing. The mixture generates less resistance than atmospheric air when passing through the airways of the lungs, and thus requires less effort by a patient to breathe in and out of the lungs.
Answer:
Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
Explanation:
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