Darwin's theory of evolution was mainly based on the evidence from the:

Explanation

Darwin's theory of evolution was primarily based on evidence from the geographical distribution of species and the fossil record. These sources offered crucial insights into how species adapted to their environments and changed over time. The geographical distribution revealed patterns that suggested common ancestry and adaptation, while the fossil record provided a timeline of evolutionary changes. Although the concept of population genetics is essential today, it was not part of Darwin's original theory. Therefore, it is correct to say that Darwin's theory was founded on both the geographical distribution of species and the fossil record.