Which of the following animals does not have the ability to change its skin colour?

Note the following:
$I.$ Dentition is heterodont.
$II.$ Canines are poorly developed.
$III.$ Incisors are chisel-like,poorly developed.
$IV.$ Herbivorous and diastema is present.
$V.$ The dental formula is $I \frac{2}{1}, C \frac{0}{0}, P m \frac{3}{2}, M \frac{3}{3}$.
Which of the above are true for $Oryctolagus$?

External ear pinna are present in $:-$

To which class does a bat belong?

Which of the following is a characteristic of all mammals without any exception?

Common among all mammals is