TAILIEUCHUNG - Lecture Biology - Chapter 1: A view of life

Lecture Biology - Chapter 1: A view of life. After studying this chapter, you should be able to accomplish the following outcomes: List the four characteristics shared by all living organisms, define emergent property in reference to the levels of organization of living organisms, explain why maintaining homeostasis is critical for living organisms, describe how the process of reproduction leads to the evolution of species,. | A view of life Chapter 1 Properties of Life Living organisms: are composed of cells are complex and ordered respond to their environment can grow and reproduce obtain and use energy maintain internal balance allow for evolutionary adaptation Levels of Organization Cellular Organization cells organelles molecules atoms The cell is the basic unit of life. Levels of Organization Organismal Level organism organ systems organs tissues Levels of Organization Population Level ecosystem community species population Levels of Organization Each level of organization builds on the level below it but often demonstrates new features. Emergent properties: new properties present at one level that are not seen in the previous level The Nature of Science Science aims to understand the natural world through observation and reasoning. Science begins with observations, therefore, much of science is purely descriptive. Science uses both deductive and inductive reasoning. The Nature of Science Deductive reasoning uses general principles to make specific predictions. Inductive reasoning uses specific observations to develop general conclusions. The Nature of Science Scientists use a systematic approach to gain understanding of the natural world. -Observation -Hypothesis formation -Prediction -Experimentation -Conclusion The Nature of Science A hypothesis is a possible explanation for an observation. A hypothesis -must be tested to determine its validity -is often tested in many different ways -allows for predictions to be made The Nature of Science The experiment -tests the hypothesis -must be carefully designed to test only one variable at a time -consists of a test experiment and a control experiment The Nature of Science If the hypothesis is valid, the scientist can predict the result of the experiment. Conducting the experiment to determine if it yields the predicted result is one way to test the validity of the experiment. The Nature .

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