Evolution Question 36

36. What is common between parrot, platypus and kangaroo?

[2007]

(a) Toothless jaws

(b) Functional post-end tail

(c) Ovoparity

(d) Homeothermy

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Answer : d

Hints & Solution

(d) Only birds and mammals are homeothermous. The only known living homeotherms are birds and mammals, though ichthyosaurs, pterosaurs, plesiosaurs and non-avian dinosaurs are believed to have been homeotherms. Other species have various degrees of thermoregulation.