Chapter 1 - Chapter 1 Introduction I. Biology What is it?...

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Chapter 1 – Introduction I. Biology – What is it? A. An ongoing inquiry into the nature of life. B. An exact definition is difficult because of the complexity of life and the diverse nature of our study of it. C. Life is characterized by: 1. Order 2. Evolutionary adaptation 3. Response to environment 4. Regulation 5. Energy processing 6. Growth and development 7. Reproduction II. Levels of Life A. Biosphere B. Ecosystems C. Communities D. Populations E. Organisms F. Organs G. Organ systems H. Tissues I. Cells J. Organelles K. Molecules III. Ecosystems A. Characterized by the cycling of materials B. Producers and consumers are responsible for and dependent upon this cycling C. Energy conservation – Energy is transformed from one form to another D. Energy flows through an ecosystem an maintains it, but at an accelerated cost of energy elsewhere E. Ecosystems are open, not closed, therefore accounting for the flow of energy through them and their ability to maintain and increase their complexity IV. Cells – The lowest level of life capable of carrying on all activities characteristic of life A. Composed of a nucleus and cytoplasm
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B. Cytoplasm contains all organelles necessary for the functioning
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This note was uploaded on 10/01/2009 for the course BIOL 101 taught by Professor Hall during the Spring '07 term at Texas A&M.

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Chapter 1 - Chapter 1 Introduction I. Biology What is it?...

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