Explanation:

- Option 1: Mendel

- Gregor Mendel is known as the father of genetics.

- He discovered the basic principles of heredity through pea plant experiments.

- His work laid the foundation for understanding genetic inheritance but not natural selection.

- Option 2: Darwin

- Charles Darwin developed the theory of natural selection.

- He explained how species evolve over time through this mechanism.

- His work "On the Origin of Species" is a seminal text in evolutionary biology.

- Correct Answer

- Option 3: Haldane

- J.B.S. Haldane was a geneticist and evolutionary biologist.

- He contributed to the development of the modern synthesis of evolutionary theory.

- He is not specifically known for natural selection.

- Option 4: Miller

- Stanley Miller was a chemist best known for the Miller-Urey experiment.

- His work was significant to theories of the origin of life rather than natural selection.