Recent research in the Chincha Valley found that pre-Inca people used seabird droppings (guano) as fertiliser to grow more maize. The valley is in:
- APeru
- BEcuador
- CBolivia
- DChile
Show answer and explanation
Correct answer: (a) Peru
Explanation
The Chincha kingdom of coastal Peru used guano by 1250 CE.