Existed during the last glacial maximum, approximately 14,000 years ago, when sea level was much lower and present-day Alaska and eastern Siberia were connected.
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.
Plants that once were only found in the America’s account for 1/3 of the worlds food supply today.
"They interact with each other" should be the answer.