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Masses-of-stars-and-galaxies-are-usually-expressed-in:
In atmosphere the lowermost layer is:
Which of the following does not belong to physical environment?
The planet that takes 88 days to make one revolution of the sun is:
The tropical grassland is called:
The main source of usable water on the Earth is:
Which from the following, is a landlocked sea?
Brightest planet in our solar system is:
Which of the following pair is INCORRECT?
An ecological system is a: