Transcription of Ch. 3 Answer Key - Lawndale High School
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Ch. 3 Answer Key - Lawndale High School
005-16_CH03_60773 10/29/01 9:36 PM Page 15. Chapter 3 The Biosphere Answer KEY. Section Review 3-1 phate in organic compounds. This organic phos- 1. a 2. e 3. c 4. d 5. b 6. Observation is important phate then moves through the food web from because it is often the first step in asking ecological producers to consumers, and to the rest of the questions. 7. Scientists use experimenting to test ecosystem. 9. Unlike carbon and nitrogen in their hypotheses. 8. Modeling is helpful because it enables cycles, phosphorus never enters the atmosphere in scientists to gain insight into very large or complex the phosphorus cycle. 10. Nitrogen is usually the phenomena. 9. Interactions among organisms within limiting nutrient in saltwater, while phosphorus is the biosphere create interdependence between organ- usually the limiting nutrient in freshwater.
9.A food chain is made of a series of steps in which organisms transfer energy by eating and being eaten. A food web is a more complex network of interactions, which links together all the food chains in an ecosys-tem. 10. Fifty kilograms of human tissue would exist at a fourth trophic level. Section Review 3-3 1.
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