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Protostome
Protostomia
(from
Greek
meaning "mouth first") are a
clade
of
animals
. Together with the
deuterostomes
and other
phyla
, they make up the
Bilateria
, mostly comprising animals with bilateral symmetry and
three
germ layers
. The major distinctions between deuterostomes and protostomes are found in
embryonic development
.
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