A scientist who was involved in the development of evolution theory is

Step 1: Analyze the question The question asks which scientist helped develop the theory of evolution. So we look for the person whose work was about how living things change over time.

Step 2: Review each option

• A. Lamarck: Jean-Baptiste Lamarck was a French biologist who proposed one of the earliest theories of evolution. He argued that organisms change through the use and disuse of organs and that these acquired characteristics are passed to offspring. The classic example is the giraffe stretching its neck to reach high leaves. His theory was later shown to be wrong, but it was a major early contribution to evolutionary thought.
• B. Mendel: Gregor Mendel is the father of genetics. He worked on inheritance in pea plants and gave us the laws of segregation and independent assortment. This is about heredity, not evolution itself.
• C. Morgan: Thomas Hunt Morgan worked on the chromosome theory of inheritance using fruit flies (Drosophila). He contributed to genetics, not directly to evolution theory.
• D. Pasteur: Louis Pasteur is known for disproving spontaneous generation and for work on germ theory, fermentation and vaccines. He is not associated with evolution theory.

Step 3: Answer Lamarck is the only scientist in the list who directly developed an evolution theory (the theory of use and disuse and inheritance of acquired characters).

Exam tip: Match the names to their fields:

• Lamarck and Darwin → Evolution
• Mendel and Morgan → Genetics and heredity
• Pasteur → Microbiology and disproving spontaneous generation

Whenever you see "evolution" in a WASSCE, JAMB or NECO question, think Lamarck, Darwin and Wallace first.