The release of which element into the ecosystem changes the food chains and food webs ?

Domestication of animals initiated which life among the primitive humans ?

Industrial revolution helped the modern human community to prove their standard of living and became :

Which is considered as the broadest earth ecosystem ?

Due to which process of the earth day and night occurs ?

Less absorption of ultraviolet rays is the depletion of :

Seasons are occured due to which process of earth ?

Which are the first life forms to colonize the early earth ?

Which is known as the big fire ball ?

Which is known as snow ball ?