In great astronomers, robert stawell ball documents the developments in astronomy from the ancient period to the nineteenth century. he begins with a chapter on the life and works of ptolemy. which sentence in this excerpt from great astronomers shows that ptolemy’s theory was flawed, but that he was still the undisputed authority on astronomy for centuries?

Read this passage from "the city without us" by alan weisman: which statement best explains how the structure of the passage supports the author's purpose? a. the passage traces several events in the order that they will occur to highlight how nature conquers human civilization. b. the passage shows that natural forces such as an absence of predators and an increase in the squirrel population can lead to destructive results. c. the passage shows that natural forms such as an absence of predators and human hunters can lead to the reforestation of new york city. d. the passage identifies how two natural forces are co-dependent - the deforestation of new york and the extinction of squirrels.