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Question 1 of 5
The sea slithers with fearsome predators, such as the starfish. Once a mussel is embraced by a starfish, for example, it is lost. Starfish use hydraulics instead of muscles, and in a tug-of-war they never tire. The starfish can drag open any shell and, as soon as the shell gapes, the starfish throws out its stomach like a white shroud and swallows the victim whole.
The primary purpose of the passage is to