B .  Area that has been colonised by the organisms
C .  Area that is yet to be explored by the organisms
D .  All of the above
E .  Is high in the tropics
Answer: Option B : B Explored area is the area that has been explored or colonised by organisms. It is different from the total area, in that regions that are not colonised or have not been explored do not form part of the explored area.
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