A great power of regeneration is found in

Options

A. Hydra
B. Sponges
C. Planaria
D. All the three

Answer

D

Explanation

Among animals, power of regeneration was first discovered in Hydra in 1740. The capacity of repeated regeneration though present throughout animal kingdom, it is more marked in the lower animal than in higher animal. Among invertebrates protozoans, coelenterates (Hydra), sponges, platyhelminthes (Planaria) is very high.