5. Is the tubular-dorsal
nervous system of chordates
associated to radial or lateral
symmetry? How does that
explain the complexity level of
the nervous system reached
by the vertebrate evolutionary
branch?

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The tubular and nervous system
of is related to
cephalization in these and to
bilateral .

The presence of integrating
centers with of neurons in
brains and the cord (central
nervous , CNS) allowed the
of the interaction
between these animals the
environment. Receptor (
conduction) and efferent (,
regulatory and behavioral )
functions come out sophisticated
in chordates to the presence
more well-developed neural .
These features have preserved by
evolution they provide adaptive
to their owners.