Which of these cannot be placed in a respirometer?
Insects
Humans
Germinating seeds

the awnser is germinating seeds.

i got this awnser correct on my 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.