The tree species most commonly used in social forestry is
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One of the best solutions to get rid of nonbiodegradable waste is
The outermost layer of Earth is called _______.
An _______________ is a sudden shaking or trembling of the earth.
Person who is colour-blind cannot distinguish between
Azadirachta indica is the botanical name of which of the following?
Chlorophyll was first isolated and named by
Which of the following is the most abundant metal on Earth's crust?