Which of the following marine fishes are considered direct descendents of fresh water ancestors?

Correct answer: D. Bony fishes

  • A. Hagfish
  • B. Jelly Fish
  • C. Star Fish
  • D. Bony fishes

Explanation

Bony fishes are generally considered to have evolved from freshwater ancestors, although many lineages later adapted to marine environments. The likely distractor is hagfish, but hagfish belong to an ancient jawless lineage rather than being the standard example of bony fishes derived from freshwater ancestors.

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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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