The hardest part of the body is ______.
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What was United Kingdom's rank in 2016 Human Development Index published by the United Nations Development Programme?
The absolute refractive index of air is
The discretionary powers of a Governor is limited in
Constantly running system - program processes are known as
Which of the following is the most abundant metal on Earth's crust?
Growing agricultural crops between rows of planted trees is known as
Which of the following fuels causes minimum environmental pollution?