How can i relate diversity on earth to either land, air or water?

Number of posts : 8 Age : 42 Registration date : 2010-07-07

I'm in grade 9 and my project's question says:
Choose any one of the realms of the Earth (land, air and water) and collect information and analyze it to find out about:-
1. The diversity of environment that exists in the world, which supports life

I've chosen water but how can I relate it to the diversity......???

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