Khurram shahzad is presenting on regeneration in invertebrates for his 6th semester zoology department course. Regeneration is defined as reactivating development after birth to restore missing tissues. There are four main methods of regeneration: stem cell mediated regeneration, epimorphosis, morphallaxis, and compensatory regeneration. Epimorphosis involves dedifferentiation of adult structures into undifferentiated cells that then redifferentiate to form the new structure, as seen in planarian regeneration. Morphallaxis is tissue regeneration due to loss or death of existing tissue, seen in hydra. Salamanders regenerate limbs through epimorphosis, forming a blastema of dedifferentiated