In GCSE Biology, 'missing links' are fossils that show the intermediate stages in the evolution of different species. They provide evidence for how one group of organisms evolved into another over time. For instance, a missing link might show how early fish evolved adaptations for life on land, giving rise to amphibians. These links are often called "transitional fossils" because they show features of both the old and new species. They help scientists fill gaps in the fossil record and better understand evolutionary history.
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