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What is common between parrot, platypus and kangaroo?
A
toothless jaws
B
functional post-anal tail
C
oviparity
D
homoiothermy
Detailed Solution
Parrot is a bird (class Aves); platypus (a prototherian) and kangaroo (a metatherian) are mammals.
Only birds and mammals are homoiothermous (warm-blooded): they maintain a constant body temperature irrespective of the temperature of the surroundings.
So homoiothermy is common to all three.
Oviparity is not common: the parrot and the platypus lay eggs, but the kangaroo is viviparous and gives birth to immature young that complete their development in the pouch.
Toothless jaws are found in the parrot (beak) and the adult platypus, but the kangaroo has teeth.
A functional tail is not a feature shared in the same way by all three.
So the common feature is homoiothermy.
Only birds and mammals are homoiothermous (warm-blooded): they maintain a constant body temperature irrespective of the temperature of the surroundings.
So homoiothermy is common to all three.
Oviparity is not common: the parrot and the platypus lay eggs, but the kangaroo is viviparous and gives birth to immature young that complete their development in the pouch.
Toothless jaws are found in the parrot (beak) and the adult platypus, but the kangaroo has teeth.
A functional tail is not a feature shared in the same way by all three.
So the common feature is homoiothermy.