Think about the animals in an
arctic ecosystem
How would those
animals adapt
over time if
global
temperatures
rise over the
next several
hundred years?

its a  

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.

answer; cnidarians;