According to the passage about bats and echolocation, what does a bat do as it closes in on its prey?
Read the passage: Many bats hunt insects in complete darkness using a skill called echolocation. As a bat flies, it produces a rapid series of high-pitched calls, most of which are too high for human ears to detect. When these sound waves strike an object, such as a moth or a branch, they bounce back as echoes. By listening carefully to the returning echoes, the bat can work out the size, shape, distance and even movement of the object. As it closes in on its prey, the bat speeds up its calls, sometimes producing a burst of sounds in a fraction of a second, which gives it ever more precise information in the final moments before it catches the insect.
Correct answer C. It speeds up its calls.
The passage states that as it closes in on its prey, the bat speeds up its calls, which gives it more precise information just before it catches the insect.
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