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BSCS Biology: An Ecological Approach Tenth edition, © 2006 by BSCS Unit 2 Overview 5415 Mark Dabling Blvd. | Colorado Springs, CO 80919 | 719.531.5550 | www.bscs.org 3281-CH05.pdf 2/16/05 12:52 PM Page 119 Continuity of Life 5 The Cell 6 Continuity through Reproduction 7 Continuity through Development 8 Heredity and Genetic Variation 9 Evolution: Patterns and Diversity I ndividuals within a population come and go, but the population itself can exist for a long time. Fossil evidence indicates the biosphere has endured for more than 3.5 billion years. Thus, there is a continuity in the biosphere. However, there also is change. The fossil record reveals that change usually has occurred slowly and systematically. This means that homeostasis exists between organisms and their environment. Unit 2 considers how continuity is maintained in populations and how populations change across time. When you look at this photograph of a mother cheetah with her young, what evidence do you see for continuity of living things? What factors are responsible for this continuity? 119 3281-CH05.pdf 2/24/06 8:21 AM Page 120 Chapter Topics Cells Are the Units of Life 5.8 Cells Move Substances in a Variety of Ways 5.1 Cell Theory: The Smallest Unit of Life Is the Cell 5.2 Biologists Use Microscopes to Study Cells 5.3 Cells Are of Two Basic Types Cell Division Cell Structure 5.4 Membranes Organize Eukaryotic Cells 5.5 Eukaryotic Cells Contain Various Organelles Cell Functions 5.6 Cell Activities Require Energy 5.7 Substances Enter and Leave Cells by Diffusion 120 5.9 The Cell’s Life Is a Cycle 5.10 Mitosis Is a Continuous Process 5.11 Cells Become Specialized during Development Investigation 5.1 Observing Cells Investigation 5.2 Diffusion through a Membrane Investigation 5.3 Cell Size and Diffusion Investigation 5.4 Mitosis and Cytokinesis