External morphological characteristic
Write down main external morphological characteristic which differentiates platyhelminthes from other worms (nematodes)?
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Platyhelminthes are also recognized as flatworms because they are worms with flat body. This is the main external morphological characteristic which differentiates them from nematodes (roundworms).
How is fecundation completed in insects (internal or external)? Is there copulation among insects? Answer: Fecundation in insects is internal, by copulation.
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