The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
I think its because we are still growing but we need healthy food not junk food so thats why we need a diet rich in protein but dont tkae my word for it get more support
D. Heterotrophic eukaryotes
Answer:
Oxygen enters the blood stream through the alveoli, which are tiny air sacs in the lungs where gas change is exchanged. Carbon Dioxide goes in through the alveoli and out goes oxygen.
2. air sacs
Hope this helps ;)
It is proven to help build healthy muscles, joints, bones etc. It also has a good effect on your academic performance, as it increases the oxygen flow to the brain.