What happens during expiration?

Given below are events occurring during inspiration. Select the correct order of sequence from the options given below.
$(I)$ Air from atmosphere rushes into lungs.
$(II)$ Thoracic volume increases.
$(III)$ Intercostal muscles contract and ribs along with sternum move upward and outward.
$(IV)$ Diaphragm becomes flat and goes downwards.

Breathing involves ...$A$... during which atmospheric air is drawn in and ...$B$... by which the alveolar air is released out.
Choose the correct option for $A$ and $B$ to complete the given $NCERT$ statement.

When do the expiratory muscles contract?

Name the important parts involved in creating a pressure gradient between the lungs and the atmosphere during normal respiration.

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