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Bottle gourds had already conquered much of the globe before 1492. Yet how they got to the Americas remained unknown. Researchers discovered via DNA analysis their pre-Columbian samples were more closely linked to African relatives than to Asian ones. Furthermore, a computer model of Atlantic Ocean currents confirmed that a bottle gourd traveling from West Africa could make it to North or South America in nine months. Yet one mystery remains: why wild bottle gourds disappeared in the Americas? Perhaps some animals that might have spread the seeds went extinct, so did wild bottle gourds.
How did researchers confirm the origins of the American bottle gourds?
AThrough artifacts found in the Americas.
BThrough flight routes between continents.
CThrough genetic analysis and study of ocean current models.正確答案
DThrough written records of North American Indian tribes.
答案與詳解
