What do you mean by grade of body organisation. Explain types of body organisation with examples.
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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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i. Body organization of unicellular animals is referred as 'Protoplasmic grade' organization. ... In case of some animals, cells come together to form tissues with the help of which all the body functions are performed. Such animals show 'Cell - tissue grade' organization.
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