[A] : The duck-billed platypus and the spiny ant-eater , both are egg-lying animals yet they are grouped under mammals .
[R] : Both of them have seven cervical vertebrae and 12 pairs of cranial nerves .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark a
B. lf both Assertion & Reason are true but the reason is no t the correct explanation of the assertion, then mark b
C. If Assertion is true statement but Reason is false, then mark c
D. If both Assertion and Reason are false statements, then mark d.

Answer

A

Explanation

To be a nammal the presence of hair and milk or mammary gland is must but presence of 7 cervical vertebrace and 12 pairs of cranial nerves are also additional mammalian characteristics. The monotremes make up by far the smallest subcalass of mammals with just three species, found in Austrlia, Tasmania, and New Gulnea. One of these is the duck-billed platypus, and the remaining two are the echidnas, or spiny anteaters. The duck-billed platypus and the spiny aneater are mammals that lay eggs rather than give live birth to young ones. The platypus has a bill like a duck, fur like a mammal and webbed feet. It lays eggs that look like reptile eggs. Its young feed from the mother's mammary glands. The spinay anteater's covering looks like that of the porcupine It has a long tongue to catch insects and a bill. It lays several eggs which it keeps in a pouch on its side.