What did Darwin NOT use to develop his theory of evolution by natural selection?finchesDNA evidencefossilsinsects

Understanding the Question

To answer what Charles Darwin did not use to develop his theory of evolution by natural selection, we should assess the evidence he relied on during his research and writings.

Analysis of Options

1. Finches: Darwin studied the varying beak shapes of finches in the Galápagos Islands, which provided critical evidence supporting natural selection.
2. DNA evidence: Darwin's work predated the discovery of DNA; therefore, he did not use this as evidence for his theory.
3. Fossils: Darwin did consider fossil records to understand the changes in species over time.
4. Insects: While not as prominently focused on as finches, Darwin did observe insects.

Conclusion

Based on this analysis, the correct answer is DNA evidence. Darwin did not use DNA evidence since the molecular basis of heredity was unknown during his time.

Final Answer

DNA evidence is what Darwin did not use to develop his theory of evolution by natural selection.