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?
jenner performed his experiments very long ago in a different kind of world.
there have been important scientific advances in the past two centuries.
jenner’s work is still relevant and important today.
few changes are needed to improve the vaccination.

However, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. what would be the best way to revise this sentence for greater clarity? a) however, the fact that columbus left spain thousands of years after people settled what would become the united states never dawned on me. b) it never dawned on me, however, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain. c) however, the fact that people were already living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. d) however, the idea never dawned on me that long before columbus ever left spain, real-life people lived for thousands of years in what would become the united states.

Connie has 4 lists about trees in her notes. which of her lists gives names of products that we can get from trees?

Highlight all instances of parallel structure. there is no longer any room for hope. if we wish to be free—if we mean to preserve inviolate those inestimable privileges for which we have been so long contending—if we mean not basely to abandon the noble struggle in which we have been so long engaged, and which we have pledged ourselves never to abandon until the glorious object of our contest shall be obtained—we must fight!