Which is not trait of prototherians ?

Ovipary

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Lack of teeth

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Absence of corpus collosum

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Extra - abdominal testes

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Solution

The correct option is D Extra - abdominal testes
Prototherians are egg-laying mammals and hence show Ovipary.
They (example platypus) lack teeth, unlike other mammals.
Corpus callosum is present only in placental mammals and hence it is absent in them.
They do not have extra abdominal testes either as it is exclusive to mammals.
So the correct answer is 'Extra-abdominal testes'.

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