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What does the appendix do? Biologists explain the complicated evolution of this inconvenient organ

Researchers demonstrate the appendix's role in immune function and gut microbiome maintenance, challenging its classification as vestigial in human evolution.

  • An explainer in The Conversation published by biologists clarifies the appendix's evolutionary history and functions, distributed via BLOX.
  • New analyses of comparative anatomy and new biological evidence challenge labeling the appendix as merely vestigial, prompting researchers to reevaluate its role.
  • Scientists point to immune-related functions as researchers describe the appendix as an immune system organ and possible gut microbiome reservoir.
  • Clarifying functions affects medical community views on appendix removal and shapes human evolution scholars’ and general public readers’ understanding of gut immunity.
  • Amid ongoing debate, the coverage addresses the scientific community's active research on whether the appendix is vestigial or functional and aims to engage the general audience.
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The ConversationThe Conversation
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What does the appendix do? Biologists explain the complicated evolution of this inconvenient organ

Most people get acquainted with their appendix when it's inflamed and about to rupture. Sebastian Kaulitzki/Science Photo Library via Getty ImagesMost people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast. That basic story traces back at least to Charles Darwin, the English naturalist who developed the theory of natural selection. In “The Descent of Man,” he described the appendix as a vestig…

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The Conversation broke the news in on Monday, March 9, 2026.
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