The four elements most common in organisms are
A) calcium, iron, hydrogen, and oxygen.
B) water, carbon, hydrogen, and oxygen.
C) carbon, oxygen, hydrogen, and nitrogen.
D) nitrogen, carbon, iron, and hydrogen.
E) phosphorus, water, carbon, and oxygen.
Correct Answer:
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Q18: Compared to carbon, silicon has the same
Q19: The atomic number of an element
A) equals
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