Which elements make up 95% (by weight) of the human body?
A) carbon,hydrogen,oxygen,nitrogen
B) carbon,hydrogen,oxygen,calcium
C) carbon,hydrogen,calcium,nitrogen
D) carbon,hydrogen,selenium,sodium
E) sodium,calcium,nitrogen,selenium
Correct Answer:
Verified
Q2: At present,there are 90 known naturally occurring
Q3: The atomic _ of an atom of
Q3: Chemistry is the branch of science that
Q4: An element with an atomic number of
Q4: Matter is anything that has weight and
Q5: Understanding _ is essential for understanding anatomy
Q7: When atoms combine with other atoms,interactions occur
Q8: Which of the following substances is NOT
Q9: The atoms of the isotopes of a
Q10: The parts of an atom that lack
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