1)How does the regeneration in Chlorohydra, Earthworm and planaria different?
Related reference:
When a hydra is cut in half, the half containing the head will regenerate a new basal disc, and the half containing the basal disc will regenerate a new head. Moreover, if a hydra is cut into several portions, the middle portions will regenerate both heads and basal discs at their appropriate ends. Regeneration - Developmental Biology - NCBI Bookshelf.
