One of alfred russel wallace's motivations to travel to south america and the malay archipelago collecting plants and animals was to sell his specimens to museums and collectors. what was wallace's other major motivation?

The other major motivation of Wallace was to understand the origin of species.

Russel Wallace was a British naturalist like Darwin. His greatest accomplishment was formulate the theory of evolution through natural selection. His theory, tough contemporary and very similar to Darwin’s evolution theory, was completely independent. They both formulate their theories roughly at the same time!