Nitrification is the biological process of converting
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The atoms of the elements having same difference between mass number and atomic number are called ______.
According to an early Indian philosopher everything is made up of ___ basic elements.
Masai is a tribe of which of the following country?
If a healthy freshwater fish is placed in salt water, what will be the expected consequence ?
Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
The centre of a cyclone is a calm area, it is called the ________ of the storm.
In 2015, underground glaciers of frozen water were discovered on
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