The correct option is
D Worked out the mechanism of evolution by natural selection.
The correct option is D.
Explanation of correct option:
- Charles Darwin was born in the year 1809 and he obtained an unpaid position as a naturalist on a survey ship in 1831 and spent five years at sea surveying South America's East Coast.
- He discovered a distinct distribution of finch species during his five-week stay on Galapagos island.
- After gathering a large amount of data, Darwin realized that in the face of strong competition among members of a population, any variation that favors survival in a certain environment would boost an individual's ability to reproduce and leave fertile offspring.
- Variations that are less favorable would reduce an individual's chances of survival.
- In 1939, Darwin developed a theory of evolution by ‘natural selection’ based on these findings.
Final answer: Darwin worked out the mechanism of evolution by natural selection.