7. Compared to
platyhelminthes which
physiological problem have
the cylindrical body of
nematodes brought? How was
that problem solved?

Gap-fill exercise

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The cylindrical shape nematodes
made impossible respiration
exclusively by diffusion among
cells there are tissues from the
exterior. problem was solved
the presence of inner cavity in
body filled with , the pseudocoelom.
The has the function
distributing gases and to the
body to collect residuals,
serving as a base to keep
worm shape.

(For fact that the
fluid and the do not
characterize true circulatory system
blood and heart is not said
in nematodes the is
cutaneous; it considered thatthese
animals make respiration by
).