Hello there! I am happy to help, but this is a very, very broad question. We could talk all day about the brain and then another day about the heart. :) I think this link may help you, though . . . https://msnucleus.org/membership/html/k-6/lc/humanbio/4/lchb4_1a.html.
Hope this helps!
I’d say it’s alveoli because across which diffusion occurs and they’re elastic so they can adjust to different pressures of gases within the lungs...
I think it’s either B or C but I’m not sure
Answer:
1st graph/diagram --> 2nd description (between top and bottom)
2nd graph/diagram --> 3rd description (bottom/last one)
3rd graph/diagram --> 1st description (top one)
It is in the place where the N involves at
