Which crop had become the backbone of Jamestown's economy by 1619? corn
tobacco
squash
cotton

Read the opening line from a draft of an informative essay. which is the best revision of the sentence? trade between great britain and japan expanded as opium deals between the nations increased in the early 1800s. britain greatly expanded trade with china, increasing its opium exports more than five times in the early 1800s. britain’s expanded trade in opium led to export increases that were five times greater in the early 1800s. britain greatly expanded trade with china, which increased its opium exports more than five times in the early 1800s.

This researchers data could him determine which of the following types of information about great britain during the industrial revolution

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?