9. Into which subphyla are the
protochordates divided? What
are some representatives of
each protochordate
subphylum?

Gap-fill exercise

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Urochordates (or tunicates)
cephalochordates are the subphyla
into which are divided.

Ascidians, animals similar to
, are examples of . The
amphioxus, well-studied Embryology,
is an of cephalochordate.