10 What is yet unknown about the bottle gourds? (A)Their ancient lineage. (B)Their connection with the ocean. (C)Their later absence in the Americas. (D)Their strange shape.

9 How did researchers confirm the origins of the American bottle gourds? (A)Through artifacts found in the Americas. (B)Through flight routes between continents. (C)Through genetic analysis and study of ocean current models. (D)Through written records of North American Indian tribes.