Which of These Observations Did NOT Influence Darwin's Later Thoughts

Question

Which of these observations did NOT influence Darwin's later thoughts about evolution?
A) North American and South American species were more similar to each other than European and African species.
B) Species on islands differed from species on the mainland closest to the island.
C) A great variety of species exist across the globe.
D) Species on different islands were very different.

Accepted Answer

Darwin observed that species on islands were different from those on the nearest mainland and that species varied across different islands, which influenced his thoughts on evolution. However, the similarity between North American and South American species compared to European and African species was not a key observation that influenced his theory.