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Pyramid of numbers in an aquatic ecosystem is .
Spring tides occur on:
The only planet whose period of rotation is longer than the period of revolution around the sun?
Masses-of-stars-and-galaxies-are-usually-expressed-in:
Sea breeze is formed during:
Land and sea-breezes occur due to:
Man can maintain an ecological balance in the biosphere by:
What is the position of the Earth when it is at the greatest distance from the sun?
The tropical grassland is called:
Hydraulic Action is a type of erosion caused by: