Which element activates many enzymes and is needed in blood and other tissues of animals?
A) magnesium
B) iron
C) sulfur
D) chlorine
E) sodium
Correct Answer:
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Q14: Which statement best describes the product of
Q15: Nitrogen has five electrons in its valence
Q16: Which statement best describes an atom?
A) A
Q17: What is the atomic mass of the
Q18: Which of the following atoms can form
Q20: Which of the following is a covalent
Q21: Which of the following would most likely
Q22: As water boils and turns to steam,
Q23: Which component becomes oxidized in the following
Q24: Which statement about van der Waal interactions
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