In the lungs, oxygen is put into the blood and carbon dioxide is taken out of the blood during the process of breathing. After the blood gets oxygen in the lungs, it is called oxygen-rich blood.
Static electricity, lightning, hot work, smoking, and electrical and mechanical sparks
Answer:
overcrowding, destitution, crime, pollution, and political turmoil
Explanation:
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A, happiness because you can clearly see when someone is happy.