Which of the following mammals is adapted for aerial life?

Which of the following animals possesses a four-chambered heart?

Given below are statements $X, Y,$ and $Z$ regarding the duck-billed platypus. Select the correct option based on these statements.
$X =$ It is an oviparous animal.
$Y =$ It has a four-chambered heart and the aortic arch curves to the right.
$Z =$ It is a mammal.

Which are exclusively viviparous?

Egg-laying mammals are found in:

Double vagina are found in