The oceans can be divided into life zones even though they are all connected because a. the rate of.

The oceans can be divided into life zones even though they are all connected because a. the rate of photosynthesis is low in the oceans. b. ocean currents keep organisms close to where they were born. c. light penetration, and hence photosynthesis, vary with depth and determine where organisms live. d. trade winds keep warm and cold waters separate. e. continents provide barriers to movement of planktonic life forms
 
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