What percentage of the earths surface is covered with water What is an aquatic life zone

Chapter 8, Problem 2

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What percentage of the earths surface is covered with water? What is an aquatic life zone? Distinguish between a saltwater (marine) life zone and a freshwater life zone, and give two examples of each. What major types of organisms live in the top, middle, and bottom layers of aquatic life zones? Define plankton and describe three types of plankton. Distinguish among nekton, benthos, and decomposers and give an example of each. List five factors that determine the types and numbers of organisms found in the three layers of aquatic life zones. What is turbidity and how does it occur? Describe one of its harmful impacts.

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