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2.2.5. Circulation pattern
Each class of vertebrates has a quite uniform type of circulation. As vertebrate's life changes from aquatic to terrestrial, the circulation becomes more complex. Fish and mammals represent two extremes in vertebrate circulation. The gradual separation of the heart into two separate pumps as the vertibrates progress from aquatic life to fully terrestrial respiration.
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Last modified: Friday, 30 December 2011, 7:09 AM