What question did Marta ask that Mr. Neal could not answer?

Marta's question about why the area is called the black vine swamp delves into the origins of the swamp's name, which often involves historical, cultural, or ecological significance. Such questions can be challenging to answer definitively, especially if there are multiple theories or if the information is not well-documented. Mr. Neal may have found it difficult to provide a conclusive answer due to a lack of concrete evidence or knowledge about the naming history of the swamp.

In contrast, questions regarding the largest animal in the swamp, the depth of the swamp water, and the types of plants that inhabit the swamp typically rely on observable data or scientific facts, making them easier to address. These aspects of swamp life can generally be measured or researched, thus allowing for clear, factual responses.