The SI unit of “pressure” is _________
Deficiency of Vitamin_D results in __________
Each day human body breathe in __________ liters of air
The most abundant element in the Earth’s crust is __________
The most abundant element in the universe is __________
The average adult has a blood volume of about __________ liters
The gas used in a refrigerator to cool water is___________
The Sun is a __________
A device which converts chemical energy into electrical energy is called __________
Radio activity was discovered by __________
