Question

What is common among Parrot, Platypus, and Kangaroo?
A. Toothless jaw
B. Functional post and tail
C. Oviparity
D. Homoiothermy

Answer 1

All birds and mammals have the ability to regulate the temperature of the body. Platypus and kangaroo both are mammals also Kangaroo is known as an Australian mammal while parrot belongs to the class Aves.

Step by step answer: Parrot and platypus do not have teeth. Only kangaroos have teeth.
-The functional tail is seen in platypus and kangaroo but not in a parrot. So, option B is also not the right answer.
-The reproductive mode in which females lay developing eggs that complete their development and hatching takes place externally from the mother is called oviparity. Parrot and platypus show oviparity whereas, kangaroo shows viviparity. In viviparity development of embryos takes place inside the body of the parent. Viviparity is seen in kangaroo animals. Hence option C is not the right answer as oviparity is not common among parrot, platypus, and kangaroo.
-Homoiothermy is seen in all birds and animals. The ability to regulate the temperature of the body is known as homoiothermy. It occurs in birds and animals which are described as endotherms. Constant body temperature is maintained by exchanging heat produced by their tissue metabolism to the external environment by various means. Constant body temperature in mammals is 36 to 38 degrees Celsius. The hypothalamus part of the brain monitors blood temperature and controls thermoregulation of the body.
Thus, homoiothermy is common in parrot, platypus, and kangaroo option D is the right answer.

Note: The homoiothermy is abandoned during the period of hibernation in certain animals. A state of minimal activity and metabolic depression in endotherms is called hibernation. Patients whose body temperature rises above $105.8{}^\circ F\left( 41{}^\circ C \right)$ are considered to be at serious risk. It causes brain damage, and patients with a temperature above $109.4{}^\circ F\left( 43{}^\circ C \right)$ will usually not survive.