Answer:
Genetics
Continental drift
Explanation:
The genetics knowledge which is a library of traits serves as an information center which can be used to analyse evolution was not available to Darwin.
The knowledge of continents being a giant raft floating on molten rock that could fit into a puzzle was not available to Darwin that could solve the solve the existence of oddly similar terrestrial species on separate continents.
The answer is b. Hope this helps!
Slightly less than 100,000
