Opercula are
A. extensions of the body wall in polychaete worms.
B. gill covers on a fish.
C. internal spaces in a planarian used in digestion and respiration.
D. gills on a lobster.
E. tentacles on a hydra.
Answer: B
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(a) double. (b) triple. (c) increase by 100 times. (d) stop.
Substrate-level phosphorylation ____
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Which of the following has/have developed antibiotic resistance?
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