A predator prey relationship. in which the populations rise and fall in response to each other is an example of A -A positive feedback loop
B - A negative feedback loop
C - A manmade feedback loop
D - all of the above

the answer is d (all of the above)

Explanation:

no

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.