9. Is the nervous system in
platyhelminthes more or less
sophisticated than in
cnidarians? What are the main
neural structures found in
flatworms? How is this neural
organization important for the
diversity of biological niches
explored by species of the
phylum?

Gap-fill exercise

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Platyhelminthes present a
sophisticated nervous system
cnidarians, as the neural chords
with (grouping of neurons)
, a characteristic of
evolutionary process of
nervous complexity. In
one can note beginning of the
process, with a
of neurons (nervous )
in the anterior of the body
the appearance of cells in
the .

With the increased of these
animals perceive and to with
the surrounds to the increased
of their neural , it
is possible find platyhelminthes in
variety of environments, the
terrestrial,and with ways of life,
those that are and those
that free-living.