2H202–2H20 + 02
How does the arrangement of atoms and bonds change?

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.