The renal portal system is absent in which of the following?

  • A
    Amphibians
  • B
    Reptiles
  • C
    Birds
  • D
    Mammals

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Which of the following is a prototherian mammal?

Which of the following is inconsistent with mammals?

Assertion : The duck-billed Platypus and the spiny ant-eater,both are egg-laying animals yet they are grouped under mammals.
Reason : Both of them have seven cervical vertebrae and $12$ pairs of cranial nerves.

The lower jaw of a mammal is made up of:

Which of the following phyla is not included in invertebrates?

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