What is the unit of heredity?

A. Cell

B. Blood

C. Gene

D. All of the above

Answer: Option C

Solution(By Examveda Team)

A gene is the basic physical and functional unit of heredity. Genes are made up of DNA.

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Ozone hole refers to

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B. decrease in the ozone layer in troposphere

C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere