Answer:
1)A
2) C
3)A
4)C
I am pretty sure these are all right :D
Explanation:
Answer:
Air pollution is known to cause irritation in the eyes, lungs, nose, and throat. It creates respiratory problems and exacerbates existing conditions such as asthma and emphysema. When continually exposed to air pollution, humans become at higher risk for cardiovascular disease.
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Answer:
31
Ans:Keeping planets in orbit around the sun.
32
Ans:one object is heavier and has more mass.