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Overview: Darwin used the words "extreme imperfection" to describe the gappy nature of the fossil record - but is this really such a problem? This article delves into the topic of transitional fossils and explores what we have learned about them since Darwin's time. This article appears at SpringerLink. Author/Source: Evolution: Education and Outreach Grade level: 13-16 Time: 40 minutes Teaching tips: This article is written for teachers and comes with links to additional examples, supplementary information, and classroom tips. It is also available as a pdf at http://www.springerlink.com/content/934652024q2677m1/fulltext.pdf Concepts: Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details. Present-day species evolved from earlier species; the relatedness of organisms is the result of common ancestry. The fossil record provides evidence for evolution. There are similarities and differences among fossils and living organisms. The fossil record contains organisms with transitional features. Evolution does not consist of progress in any particular direction. Scientific knowledge is open to question and revision as we come up with new ideas and discover new evidence. Our knowledge of the evolution of living things is always being refined as we gather more evidence. Scientists use fossils (including sequences of fossils showing gradual change over time) to learn about past life. Teacher background: Evidence for Evolution

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