Answer:
Personally, i think this model is wrong because the arrows point that carbon dioxide enters the lungs and leaves as oxygen which is totally the opposite, but he or she has showed that the oxygen breathed in is used in the oxygenation of the blood. I may be wrong but it doesn't seem right if you think about it. But if you look really hard at it, the oxygenated blood changes it to carbon, and then carries it back to the lungs to be inhaled.
Explanation:
Answer:
D.
Explanation:
Sufficient inheritable variations
“C” is the correct answer
By universe expanding
by galaxies looking redder than they should be
capturing the afterglow of the big bang
how starlight differs from microwaves
peeking back in time