Answer:In 2019, the United States consumed about 31.01 trillion cubic feet (Tcf) of natural gas.
Explanation:
<span>C. nitrogen and hydrogen shoould be your answer
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The hormone calcitonin, which is produced by the parafollicular or C cells of the thyroid, has the opposite effect on blood calcium levels as does PTH. I hope this helps! : )
Alveoli walls are composed of Type 1 and Type 2 alveolar cells