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What is true for mammalia :
A
Platypus is oviparous
B
Bats have feathers
C
Elephant is ovoviviparous
D
Diaphragm is absent in them
Detailed Solution
Most mammals are viviparous, but the monotremes, platypus (Ornithorhynchus) and spiny anteater (Echidna), lay eggs. So the platypus is oviparous; true.
Bats have hair, not feathers (feathers are found only in birds); elephants are viviparous; and all mammals have a diaphragm.
So the true statement is that platypus is oviparous.
Bats have hair, not feathers (feathers are found only in birds); elephants are viviparous; and all mammals have a diaphragm.
So the true statement is that platypus is oviparous.