Read this excerpt from "Edward Jenner and the History of Smallpox and Vaccination.” Scientific advances during the two centuries since Edward Jenner performed his first vaccination on James Phipps have proved him to be more right than wrong.

Which is the author’s central claim in this excerpt?
A Sequential life events of an individual are provided.
B Random dates are included to help show time order.
C Information is provided about the history of smallpox.
D Names of people connected to smallpox are included.

Find the center and the radius of the circle with the equation: x^-2x+y^2+4y+1=0

Coming to school each day, having the necessary materials, and to do homework students to be successful in school. choose the answer that is the most effective substitute for the underlined part of the sentence. if no substitute is necessary, choose ‘leave as is.’ a) leave as is. b) coming to school each day, have the necessary materials, and do homework c) come to school each day, having the necessary materials, and to do homework d) coming to school each day, having the necessary materials, and doing homework

Name five of the six points you should check,or have checked, when you are practicing your speech by recording it or with a f listening