Read this excerpt from "edward jenner and the history of smallpox and vaccination." the origin of smallpox as a natural disease is lost in prehistory. it is believed to have appeared around 10,000 bc, at the time of the first agricultural settlements in northeastern africa. it seems plausible that it spread from there to india by means of ancient egyptian merchants. what is the central claim of the excerpt?

Which best describes the purpose of the second continental congress?

In a few sentences, explain how the medici family contributed to the renaissance.

Some organisms have a large geographic range. for example, the norway rat lives on every continent except antarctica. a population of norway rats is the number of rats in one particular area. do you think it’s scientifically possible for a population of norway rats in north america to carry different genetic mutations than a population of norway rats in africa? do you think it’s possible that they carry some of the same mutations? what types of information can scientists learn by studying the genomes of these two populations of rats?