{
  "chunks": [
    {
      "chunk_id": "intro-essay-body-1",
      "role": "body",
      "section": "Intro Essay",
      "text": "Evolution is a change in the gene pool of a population over time. Populations evolve. Individual organisms do not evolve, because they retain the same genes throughout their lives.",
      "line_start": 1,
      "line_end": 4
    }
  ]
}