Here’s a conversation worth talking about: A mother dolphin chats with her baby…over the telephone! The special call 1 in an aquarium, where the mother and her calf swam in separate tanks connected by an audio link. The two dolphins began 2 to each other. It seemed clear that they knew 3 – but what were they saying? That’s what scientists are trying to find out. They haven’t completely cracked the code yet, but they’re listening…and learning.
In many ways, 4 Like them, dolphins are mammals and must swim to the surface to breathe air. They team up in pods, or groups, to accomplish tasks. They also talk to each other, 5
 Sometimes one dolphin will vocalize and then another will seem to answer. Sometimes members of a pod vocalize in different patterns at the same time, 7 And just as people gesture as they talk, dolphins communicate through 8
Scientists think dolphins “talk” about everything from basic facts like their age to their emotional state. When the going gets 9 dolphins call for backup. After being bullied by a duo of bottlenose dolphins, one spotted dolphin returned to the scene the next day with a few pals to 10 one of the bully bottlenose dolphins. It’s as if the spotted dolphin communicated to members of his pod that he needed their help, then led them in search 11 the offender.
Kathleen Dudzinski, director of the Dolphin Communication Project, has listened to dolphins for more than 17 years, using high-tech gear 12 But she says she’s far from speaking “dolphin” yet. Part of the reason is the elusiveness of the animals. Dolphins are fast swimmers who can stay underwater for up to ten minutes. Dudzinski 13 dolphins is like studying icebergs because they spend most of their lives underwater.
Deciphering “dolphin speak” is also tricky because their language is so dependent on whether they’re playing, fighting, or seeking food. It’s no different for humans.  During fights, for example, dolphins clap their jaws, but they jaw clap while playing, too. If you like mysteries and detective work, 15 And who knows—maybe someday you’ll get a phone call from a dolphin.
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Which of the choices best introduces the central theme of the second paragraph and provides an appropriate transition?CorrectIncorrect
At this point in the essay, the writer is considering adding the following sentence:
Starting from birth, dolphins squawk, whistle, click, and squeak.
Should the sentence be added?CorrectIncorrect
Which of the following best develops the parallel that the author wishes to draw between human and dolphin behavior?CorrectIncorrect
Which choice would most effectively describe the technology’s use given the focus of Kathleen Dudzinski’s research?`CorrectIncorrect
At this point in the essay, the author is considering adding the following sentence:
Under different circumstances, the same gesture can mean good-bye, stop, or “that costs five bucks.”
Would this be a relevant addition to the paragraph?CorrectIncorrect