It is impossible for humans to be at the bottom of the food chain. a. true, because plants do not undergo cell respirationb. false, because humans are omnivoresc. true, because humans are not producers d. false, because humans carry out photosynthesis

i believe the answer is c.true, because humans are not producers  

Explanation:

not only is it colder, it also becomes darker, less salty, and more dense.

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.