Approximate age of earth is ________?

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The gas, commonly known as “laughing gas”, is

A. Carbon Dioxide B. Sulfur Dioxide C. Nitrous Oxide D. Sodium Oxide...

A light year is a unit of ?

A. Time B. Energy C. Length D. Mass...

The main function of kidney is____________?

A. to control blood pressure B. to control body temperature C. to remove waste from blood D. to help in digestion of bady...

Telephone was invented by__________?

A. Vint Cerf B. Charles Babbage C. Edison D. Alexander Graham Bell...

Plant have ____ while animals lack it.

A. starch B. cellulose C. protein D. fat...