How do bacteria cause disease? O A. By reproducing inside a host cell and causing the cell to break
open
B. By replacing the host cells with bacterial cells
C. By releasing harmful proteins or other poisons into the host's body
D. By injecting DNA into the genome of a host cell

d

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.

a symbiotic relationship with the mitochondria