Have you looked it up online
Answer: A. drought
Explanation:
It is A because their environment changed alot so it was difficult to grow corn and so the migrated south where it rained more.
The Exxon Valdez was the oil tanker that caused one of the worst oil spills in history. It spilled nearly 11 million gallons of oil, injuring over 28 species of wildlife. It lead to the use and building of double-hulled ships.
Placing a Discharge Calendar
hope this helped! (:
