4. Gills in freshwater crayfish provide a(n) a. advantage for oxygen intake but

Question

4. Gills in freshwater crayfish provide a(n) a. advantage for oxygen intake but a disadvantage for water intake. b. advantage for oxygen intake and an advantage for water intake c. disadvantage for oxygen intake and a disadvantage for water intake. d. disadvantage for oxygen intake but an advantage for water intake. 5. In adult freshwater fish, the major site of sodium exchange is the a. kidney. c heart. d. skin. 6. Species that are able to survive only within a narrow range of ambient salinities are called a. conformers b. stenohaline. c. euryhaline. d. xeric.

Explanation / Answer

4. The correct answer is A.

the advantage for oxygen intake and disadvantage for water intake.

5. The correct answer is B.

gills are the site for exchange of sodium ions.

6. The correct answer is B.

stenohalines cannot tolerate wide fluctuation in the salinity of water.

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