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7th Grade Unit 2: Ecosystems Lesson 3: Succession and Equilibrium Vocabulary of Instruction: Climax Community •Is a stable group of plants and animals that is the end result of the succession process. Equilibrium • Is the condition of a system in which competing influences are balanced Pioneer Species • Are those organisms, usually plants, that colonize barren rock or lava during primary succession. • Examples: Mosses Lichens Ferns weeds Mosses Lichens Ferns Weeds Primary Succession •Is the earliest phase of ecosystem development. Secondary Succession • Describes the changes in the kinds of plants and animals that live in a particular community over time. Succession • Directional, orderly process of change in a living community in which the community modifies the physical environment to eventually establish an ecosystem which is as stable as possible at the site in question.