The characteristics of flatworms are
I. Acoelomate
II. Radial symmetry
III. Development of a head

I only

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II only

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III only

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I and III only

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I, II, and III

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Solution

The correct option is D I and III only
Flatworms are acoelomates animals that are characterized by having three germ layers (ectoderm, mesoderm, and endoderm). They do not have a true body cavity.
They are unsegmented worms with a tail and a head end. They are bilaterally symmetrical with a definite upper and lower surface.
Flatworms have a cephalized nervous system that consists of head ganglion, usually attached to longitudinal nerve cords that are interconnected across the body by transverse branches.
Hence, the correct answer is option D.

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