Which four elements make up approximately 96% of living matter?
A) carbon, hydrogen, nitrogen, oxygen
B) carbon, sulfur, phosphorus, hydrogen
C) carbon, sodium, chlorine, magnesium
D) carbon, oxygen, sulfur, calcium
E) oxygen, hydrogen, calcium, sodium
Correct Answer:
Verified
Q13: Free radicals are considered dangerous because they:
A)attack
Q14: Phosphorus has an atomic number of 15,
Q15: A substance with specific properties that cannot
Q16: An atom's nucleus is composed of:
A)protons only.
B)neutrons
Q17: Imagine that you have been hired as
Q19: For an atom to achieve maximum stability
Q20: Sulfur is an essential element in the
Q21: Carbon has atomic number 6. Carbon most
Q22: What does HOH represent?
A)an atom of water
B)a
Q23: What type of bond is easily disrupted
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