Which of the following is commonly cited as evidence for Darwin's theory of evolution?

• A. Fossil records
• B. Comparative anatomy
• C. DNA sequences
• D. Taxonomy

Answer: (A)

Fossil records provide evidence for evolution because they show a historical sequence of life changing over long periods of time. By studying organisms preserved in sedimentary layers, scientists can trace how traits shift across eras and how new groups branch from earlier ones. Dating fossils places these changes on a timeline, revealing patterns of descent with modification that align with how species diversify. Examples of transitional fossils—the intermediate forms between major groups—illustrate the gradual progression from one lineage to another, which is exactly what Darwin proposed.

Modern genetic data, like DNA sequences, also support evolution by confirming relatedness at the molecular level, and comparisons of anatomy reveal how similar structures hint at common ancestors. However, fossils offer the most direct, time-ordered record of how life has changed, making them the most commonly cited form of evidence for evolution.