What do you mean by organ system grade of organisation?
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Organs appear first in the Platyhelminthese (flatworms). E. Organ system grade of organization. When organs work together to perform some function (circulation, respiration, reproduction, digestion, etc.) we have the grade of organization seen in all animals that evolved after the flatworms.
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Organs appear first in the Platyhelminthese (flatworms). E. Organ system grade of organization. When organs work together to perform some function (circulation, respiration, reproduction, digestion, etc.) we have the grade of organization seen in all animals that evolved after the flatworms...
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