Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by all forms of life?
A) arsenic
B) iodine
C) mercury
D) iron
Correct Answer:
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Q10: Which of the following has the smallest
Q11: How many electrons are present in a
Q12: Q13: Which of the following best explain why Q14: An ion with six protons, seven neutrons, Q16: The atomic number of nitrogen is 7. Q17: About 25 of the 92 natural elements Q18: Which of the following is true of Q19: Which of the following atoms has the Q20: Which of the following are compounds?
A) H2O,
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