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Balaenoptera, Camelus, Delphinus, Macropus, Ornithorhynchus, Pteropus - Choose the odd one out with reason

( a ) Ornithorhynchus is a member of class - Aves
( b ) Ornithorhynchus is an Oviparous mammal
( c ) Balaenoptera is a pteridophyte
( d ) Pteropus is not a mammal
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(B) is the right answer.

Class – Mammalia : Examples: Oviparous-Ornithorhynchus (Platypus); Viviparous - Macropus (Kangaroo), Pteropus (Flying fox), Camelus (Camel), Delphinus (Common dolphin), Balaenoptera (Blue whale).
answered Jan 3, 2014 by pady_1
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