The Sun is a __________.
Star
Planet
Asteroid
Meteor
The average adult has a blood volume of about __________ liters.
4
5
6
7
The most abundant element in the universe is __________.
Oxygen
Hydrogen
Carbon Dioxide
Silicon
The most abundant element in the Earth's crust is __________.
Oxygen
Hydrogen
Carbon Dioxide
Silicon
Each day human body breathe in __________ liters of air.
5,000 to 10,000
10,000 to 15,000
15,000 to 20,000
20,000 to 25,000
Deficiency of Vitamin-D results in __________.
night blindness
rickets
scurvy
hair fall
The SI...