13 Drag and drop the pris to make a chart that correctly shows how relationships among these are integrated DRAG A DROP THE ANSWER
Simple
organ system
organs
organism
tissues
Complex

Morphological changes to function appendages arise because of different requirements this was termed by Darwin as adaptive radiation. For example darwins finches - each birds beak was slightly different in shape - this allowed them to exploit a different food source, thereby reducing intra specific competition. As for fins, these vary depending on the swimming requirements of the organism; balance, agility or speed may be selected for.