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What is a strait?
A biome is:
The deepest surface depression on the earth is:
The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
Which of the following exhibits unidirectional flow in an ecosystem?
The space retaining life in any form is called:
What is meant by Isthmus?
In mountainous areas a natural cause for road blocks is often
The climatic zones are classified on the basis of:
The planet emitting green light is: