Answer:
C?
Explanation:
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Human activities that can increase the rate would be air from a car exhaust, large factories, and gas lawn mowers. All of these make rain more acidic which causes more chemical weathering.
The tricuspid valve is situated between the right atrium and right ventricle.
The pulmonary valve is between the right ventricle and the pulmonary artery. The mitral valve is between the left atrium and left ventricle.