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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Which holds the most dissolved oxygen?

  1. a. warm, still water
  2. b. warm, running water
  3. c. cold, running water
  4. d. cold, still water

Summary Introduction

Concept introduction: Dissolved oxygen is the amount of the gaseous oxygen that dissolves in water. By direct absorption, oxygen enters the water. The DO level that drops below 5.0MG/L causes stresses to aquatic life. The lower concentration can also cause greater stresses to the aquatic life.

Explanation

Reasons for correct answer:

Because of the churning, running water dissolves more oxygen than the still water. Cold water contains more dissolved oxygen than the warm water.

Option c. is given as “cold, running water”. Cold, running water hold more dissolved oxygen than the still, warm water. Therefore, option c. is correct.

Reason for incorrect answer:

Option a. is given as “warm, still water”.

Warm, still water has less dissolved oxygen than cold, running water...

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