Section 1

Introduction to Ecology

• Species interact with both other species and their nonliving environment.

• Interdependence is a theme in ecology, and states that one change can affect all species in an ecosystem.

Vocabulary ecology (p. 359) interdependence (p. 359)

ecological model (p. 360) biosphere (p. 361)

• Ecological models help to explain the environment.

• Ecology is usually organized into five levels: organism, population, community, ecosystem, and biosphere.

ecosystem (p. 362) community (p. 362)

population (p. 362)

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