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The increased integration of digital technologies throughout the process of book creation in the late 20th and early 21st centuries lowered the costs of book production, but those decreased costs have been most significant in the manufacturing and distribution process, which occurs after the authoring, editing, and design of the book are complete. This suggests that in the late 20th and early 21st centuries, _________
Which choice most logically completes the text?
digital technologies made it easier than it had been previously for authors to write very long works and get them published.
customers generally expected the cost of books to decline relative to the cost of other consumer goods.
publishers increased the variety of their offerings by printing more unique titles but also printed fewer copies of each title.
the costs of writing, editing, and designing a book were less affected by the technologies used than were the costs of manufacturing and distributing a book.
Biological Valentina Gomez-Bahamon and her team have investigated two subspecies of the fork-tailed flycatcher bird that live in the same region in Colombia, but one subspecies migrates south for part of the year, and the other doesn't. The researchers found that, due to slight differences in feather shape, the feathers of migratory forked-tailed flycatcher males make a sound during flight that is higher pitched than that made by the feathers of nonmigratory males. The researchers hypothesize that fork-tailed flycatcher females are attracted to the specific sound made by the males of their own subspecies, and that over time the females' preference will drive further genetic and anatomical divergence between the subspecies.
Which finding, if true, would most directly support Gomez-Bahamon and her team's hypothesis?
The feathers located on the wings of the migratory fork-tailed flycatchers have a narrower shape than those of the nonmigratory birds, which allows them to fly long distances.
Over several generations, the sound made by the feathers of migratory male fork-tailed flycatchers grows progressively higher pitched relative to that made by the feathers of nonmigratory males.
Fork-tailed flycatchers communicate different messages to each other depending on whether their feathers create high-pitched or low-pitched sounds.
The breeding habits of the migratory and nonmigratory fork-tailed flycatchers remained generally the same over several generations.
Xin Wang and colleagues have discovered the earliest known example of a flower bud in a 164-million-year-old plant fossil in China. The researchers have named the new species Florigerminis jurassica. They believe that the discovery pushes the emergence of flowering plants, or angiosperms, back to the Jurassic period, which occurred between 145 million and 201 million years ago.
According to the text, how old was the fossil that Wang and colleagues discovered?
150 million years old
145 million years old
164 million years old
201 million years old
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