12. ________ Why are doctors using "probiotic remedies?" (A) because people need more antibiotics (B) to keep healthy bacteria in the body (C) because all bacteria is dangerous (D) to develop new bacteria

18. _______ Which statement best reflects the position of Aiello and other paleoanthropologists (paragraphs F-G)? (A) Humans are biologically designed to follow a single ideal diet rooted in the Paleolithic era. (B) Dietary health depends mainly on eliminating foods introduced by agriculture. (C) Human health is best explained by genetic limits on digesting farmed foods. (D) Human dietary success comes from flexibility and adaptation rather than a fixed "caveman diet."

12. ________ Why are doctors using "probiotic remedies?"
(A) because people need more antibiotics
(B) to keep healthy bacteria in the body
(C) because all bacteria is dangerous
(D) to develop new bacteria

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