GEOG 170A1 Lecture Notes - Lecture 3: Emergence, Blood Sugar, Archaea
11 Sep 2015
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Document Summary
20 species become extinct each year in the rain forest. The extinction rate is accelerated by human activity. Biologists study life by considering its diff. levels of organization. Properties that define life often emerge from interactions of basic components. Characteristics of a system that doesn t appear in any of its components. Molecules of life: lipids, proteins, rna, dna, complex carbohydrates. Specific cell types organized in a particular pattern. Group of tissues that collectively carry out a task or set. All population of all species in a given area. Require ongoing inputs of energy and raw material. Flows from environment through organisms and back to environment. In each energy transfer, some energy escapes as heat. Substance that an organism must have for growth and survival, and cannot make itself. Acquire energy and raw materials fro the environment. Added sugars cause cells to take up sugar faster. Process of keeping conditions in a range that favors survival.
