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As one moves from the polar region towards equator the diversity of plant and animal species .
Masses-of-stars-and-galaxies-are-usually-expressed-in:
Source of energy in ecosystem is:
The main cause of global climatic change is:
Which is the most stable eco-system?
The Mohorovicic (Moho) Discontinuity separates:
Condensation is the reverse of:
The pole star indicates which direction?
A biome is:
Which from the following, is a landlocked sea?