Most of the marine invertebrates are__________?
Correct answer: A. Osmoconformers
- A. Osmoconformers
- B. Osmoregulators
- C. Both depend upon the concentration of sea water
- D. None of these
Explanation
Most marine invertebrates are osmoconformers, meaning their internal osmotic concentration changes in close relation to that of seawater. The likely distractor is osmoregulators, which actively maintain a relatively constant internal osmotic concentration despite external changes.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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