Biology 12

429

Chapter

Contents

13.1 Where on Earth Do

You Find Organisms? 430

Investigation 13-A: Foraging

Strategies — A Simulation

Experiment 437

13.2 The Structure

of Ecosystems 440

Thinking Lab:

Shrinking Polar Bears

and Expanding Snow Geese 441

13.3 Energy Flow

in Ecosystems 444

MiniLab: Where Do You

Fit in the Food Chain? 447

Thinking Lab: Biological

Magnification 449

13.4 Nutrient Cycling in

Ecosystems 451

Design Your Own Investigation

13-B: Ecosystem Productivity 458