Explanation:
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One reason is for safety! in case you get stranded in a body of water you can keep yourself afloat
Splitting H20 is the Apex answer
Decomposers can break down any dead organic matter. Since any of the organic matter consume can come from any level, there isn't a specific place for decomposers. It is hard to place them because as you travel up the food pyramid energy is lost. Decomposers would have their own level because of this.