1. Ecological Succession
A process where one community of organisms slowly replaces another in an area.
Image from: Definition: ScienceSaurus glossary, page 482.

2. Primary Succession
Succession that begins without soil, such as when lava flow covers an area or a glacier retreats.
Image from: Definition:

3. Pioneer Species
The first organisms to live in an area, usually mosses and lichens.
Images from: Definition: ScienceSaurus glossary, page 506.

4. Secondary Succession
The normal re-growth of organisms into an area where soil already exists.
Image from: Definition:

5. Climax Community
The point when an area reaches a stable point where very few new plants or animals are introduced.
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6. Which time frame represents the most stable community?

7. REVIEW
Primary succession takes place on newly exposed surfaces, where no living things have ever grown before.
Secondary succession occurs when an existing community is destroyed or disturbed and then regrows through a series of stages.