What changes made humans dominant species from the past 4 million years

There's no doubt that humans have changed the face of the planet in countless ways since we first arose as the dominant species on Earth. ... mammal communities throughout the past 300 million years by examining species pairs. ... The polar regions contain snow and ice that's been around for millennia.

Explanation:

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.