Assertion: horseshoe crab's gill | /r/SimilarTo | the pages of a book
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Source sentences:
text: In addition to anti-pathogen blue blood, the horseshoe crab has gills that are like the pages of a book allowing it to breath out of water so long as its gills stay wet, ten eyes for detecting potential mates, food and predators, and the ability to produce 90,000 fertile eggs a year.