What is the difference between pulmonary respiration in frogs and human respiration?

Arrange the given steps of expiration in the sequence of events occurring first:
$I.$ Relaxation of the diaphragm and sternum
$II.$ Reduction of the pulmonary volume
$III.$ Expulsion of air from the lungs
$IV.$ Increase in intra-pulmonary pressure
Choose the correct option.

Inspiration is initiated by

What is the most important function of the diaphragm in mammals?

Which of the following activities does not take place during pulmonary respiration in amphibians (e.g.,frogs)?

Additional muscles in the ...... impact the ability of humans to increase the strength of inspiration and expiration. Complete the given $NCERT$ statement with an appropriate option.