CHAPTER 3 - CHAPTER 3 ECOSYSTEMS: HOW THEY WORK Matter,...

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CHAPTER 3 ECOSYSTEMS: HOW THEY WORK Matter, Energy and Life Fig. 3.1 From a biological point of view, the three most important gases of the lower atmosphere are nitrogen, oxygen, and carbon dioxide.
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Fig. 3.2 Water consists of molecules, each of which is formed by two hydrogen atoms bonded to an oxygen atom (H2O). In water vapor, the molecules are separate and independent. Fig. 3.5 The organic molecules making up living organisms are larger and more complex than the inorganic molecules found in the environment. Glucose and cystine show this relative complexity.
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Fig. 3.3 The atoms of most elements gain or lose one or more electrons, becoming negative (-) or positive (+) ions. The ions are held together by an attraction between positive and negative charges. Fig. 3.6 Biological systems include levels of complexity beginning with atoms and molecules and broadening up to the biosphere.
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Fig. 3.7 Kinetic energy is energy in one of its active forms. Potential energy refers to systems or materials that have the potential to release kinetic energy. Fig. 3.8 Any form of energy can be converted to any other form, except heat energy. Heat
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is a form of energy that flows from one system or object to another because the two are at different temperatures. Therefore it can only be transferred to something cooler. III. Energy
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CHAPTER 3 - CHAPTER 3 ECOSYSTEMS: HOW THEY WORK Matter,...

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