Which is least likely to be a point source pollutant? a)industrial waste
b) exhaust from factories
c) litter on the beach
d) sewage treatment plants

Sewage treatment plants

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.