Moderate

A fish in marine water:

Correct answer: D. (A) and (B)

  • A. Produces concentrated urine
  • B. Have a hypotonic body
  • C. Produces dilute urine
  • D. (A) and (B)

Explanation

Animal body fluids are kept isotonic to the external environment, even for marine saltwater environment. These animals thus do not require actively to adjust their internal osmotic state, so are known as osmoconformers.

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About Homeostasis

Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.

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