Which is a nonpoint source of pollution?
a. tourists throw trash into the ocean
b. a car mechanics pours oil on the ground
c. rain contains chemicals that seep into the ground
d. a pipe dumbs waste from a factory into a stream

its C

Explanation:

i just took the test

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.