Q. Thegiven figure shows a cross section of the body of an invertebrate. Identify the animal which has such body plan,
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 2058  195 Animal Kingdom Report Error

Solution:

The animals in which the coelom is absent are called acoelomates, for example flatworms (Planaria). In them the space between ectoderm and endoderm is filled with parenchyma derived from mesoderm.