Pace maker is related with

A. Kidney

B. Brain

C. Lung

D. Heart

Answer: Option D

Solution(By Examveda Team)

A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.

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Ozone hole refers to

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere