Carbon has 4 electrons and hydrogen has 1 electron in its outermost electron shell. A carbon atom can form covalent bonds with how many hydrogen atoms?
A. 1
B. 2
C. 0
D. 3
E. 4
Answer: E
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Tubular secretion is essential for ___
homeostasis.
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a. True b. False Indicate whether the statement is true or false