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The correct answer is B
Identify the gas that is not considered a permanent part of the Earth's atmosphere.
Identify the most abundant metal in the earth's crust.
What is the role of Ultraviolet Radiation (UV) in the water purification systems?
1. It inactivates/kills the harmful microor...
The number of ______ is equal to the difference between the mass number of the atom and the atomic number.
Who discovered the Rh factor in blood in the year 1940?
How does a bulb glow when the switch is turned on?
What element is primarily used in a Proton Fusion Engine?
What is the nature of the image formed on the retina of the human eye?
Who is credited with the discovery of the neutron particle in an atom?
What causes the permanent hardness of water?
