6. Beings from four phyla of
the animal kingdom “breath”
(do gas exchange) by
diffusion. Which are those
phyla? How is this type of
respiration associated to
features present in those
animals?

Gap-fill exercise

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The phyla of animal kingdom whose
do gas exchange diffusion are
the , the cnidarians, the
(flatworms) and the
(roundworms). This type
respiration in these is possible
because tissues and cells
relatively close to exterior.