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The squid's body plan has developed for fast action. The shell is reduced to a thin "pen." The mantle wall has elastic fibers that intensify the jet propulsion. Giant nerves allow a fast reflex and three hearts pump oxygen to the gills. [1:34]
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- Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
- The intended use for this resource is Instructional