Which of the following is an ore of iron?
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Helium is added to the oxygen supply of deep sea divers because it is _________
Study of classification of organisms is known as _____.
A __________ thread is actually stronger than a steel wire.
Which of the following metal (shown by its symbol) is generally used for making filaments of bulb?
The process of producing energy in plants is known as
The exchange of materials between blood and interstitial fluid occurs only at the _____.
The process of pollination by birds is also known as
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