Can someone give me a brief history of yellow fever?

Yellow fever virus originated in Africa and was brought to the western hemisphere during the slave trade era, with the first epidemic reported in 1648 in the Yucatan. Over the ensuing 200 years, outbreaks occurred widely in tropical America, the North American coastal cities, and Europe.

Explanation:

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is