An example of homologous organs is: (a) our arm and a dog's fore-leg. (b) our teeth and an elephant's tusks. (c) potato and runners of grass. (d) all of the above.

Correct option : (d) All of the above

Explanation

All of the above pairs are structurally the same and have similar evolutionary relations. A homologous structure is an example of an organ or bone that appears in different animals, underlying anatomical commonalities demonstrating descent from a common ancestor.

  • The arm of a human and the leg of a dog are homologous structures. They are different and have different purposes, but they are similar and share common traits.
  • Elephants’ tusks are specialized incisors for digging food up and fighting. They are homologous structures to human teeth, inherited from a common ancestor with incisor teeth.
  •  The corm of colocasia, the tuber of potato, and the runner of lawn grass are all homologous structures.

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