What changed about the peppered moth population during the Second Industrial Revolution?

Moth became dark colored

Explanation:

Before industrial revolution, the peppered moth were of light color but with advent of industrial pollution, the barks of the tree became dark and in order to escape from the sight of the predators (that feed on light colored moth visible against the dark colored bark) these light colored moths evolved into dark colored moth.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.