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Problem

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question

Many marine birds drink seawater yet maintain their internal osmolarity at a constant level that is hypoosmotic to seawater. Which of the following physiological strategies best explains how the birds maintain their tissue osmolarity?

choices

  1. Marine birds absorb water from the environment through specialized salt-exchange glands and produce large volumes of dilute urine in the kidneys.
  2. Marine birds absorb salts from the environment through specialized salt-exchange glands and produce large volumes of concentrated urine in the kidneys.
  3. Marine birds excrete salts through specialized salt-exchange glands and excrete small volumes of urine.
  4. Marine birds excrete salts and nitrogenous wastes through specialized nasal glands.

subject

college_biology

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