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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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Carbon is released into the atmosphere by _______.

  1. a. photosynthesis
  2. b. the greenhouse effect
  3. c. burning fossil fuels
  4. d. fertilizer use

Summary Introduction

Concept introduction: Carbon is the most abundant substance in living things. In the carbon cycle, carbon circulates among Earth’s atmosphere, oceans, rocks, and soils, and into and out of food webs.

Explanation

Reasons for the correct statement:

Option c. is given as “burning fossil fuels”. The atmosphere holds less carbon than rocks, seawater, or soil. It serves as the source of CO2 for land producers. The burning of fossil fuels adds carbon to this reservoir. The burning of this fuel adds about 9 gigatons of CO2 to the atmosphere every year. A change in the carbon isotope ratios in the atmosphere indicate that the additional CO2 is derived from the burning of fossil fuels, rather than some natural process that releases this gas.

Carbon is released into the atmosphere by burning fossil fuels. Option c. is correct.

Reasons for the incorrect statements:

Option a...

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