Which of the following statements regarding saltwater fish is true?
A) The concentration of solutes in the internal fluids of saltwater fish is lower than that in the surrounding water.
B) The concentration of solutes in the internal fluids of saltwater fish is higher than that in the surrounding environment.
C) Saltwater fish produce large amounts of diluted urine.
D) Saltwater fish have body fluids with a solute concentration equal to their surroundings.
Answer: A
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At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
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Earthworms show all of the following features except
A. containing segments with a mouth on the first and the anus on the last. B. containing touch-sensitive and light-sensitive organs in the segments. C. containing fewer setae than in polychaetes. D. containing distinct head regions and parapodia. E. being hermaphroditic.