What did the astronauts fail to do which would have saved them from falling haphazardly through space?

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Read this excerpt from "edward jenner and the history of smallpox and vaccination.” smallpox was introduced to europe sometime between the fifth and seventh centuries and was frequently epidemic during the middle ages. the disease greatly affected the development of western civilization. the first stages of the decline of the roman empire (ad 108) coincided with a large-scale epidemic: the plague of antonine, which accounted for the deaths of almost 7 million people. the arab expansion, the crusades, and the discovery of the west indies all contributed to the spread of the disease. unknown in the new world, smallpox was introduced by the spanish and portuguese conquistadors. the disease decimated the local population and was instrumental in the fall of the empires of the aztecs and the incas. similarly, on the eastern coast of north america, the disease was introduced by the early settlers and led to a decline in the native population. before it reached the new world, smallpox played a role in

1point for this topic sentence, what would not be a good concluding sentence for the paragraph? topic sentence: the u.s. government's resistance to put polar bears on the list of endangered species has allowed for the continued decrease of the already threatened population. o a. any more delay will surely result in the continued loss of polar bear populations. o b. i saw a polar bear in a zoo, and it looked sad to not be in the wild o c. without swift action, polar bears may soon be extinct in the wild. o d. any of these would be a good concluding sentence,