Development of the vertebrate head and sense organs was largely the result of two innovations:
A) Appearance of an outer epidermis and an inner dermis
B) Neural crest and ectodermal placodes
C) Living endoskeleton and highly differentiated brain
D) 10 to 12 pairs of cranial nerves and an autonomic nervous system
E) Pharynx and endocrine system
Correct Answer:
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Q22: Of the five chordate hallmarks,adult tunicates have
Q23: Unlike most invertebrate phyla,the nerve cord of
Q24: The lancelets or Branchiostoma are found
A)very rarely
Q25: In both tunicates and cephalochordates,the ventral side
Q26: The ostracoderms
A)are the adult form of the
Q28: While several invertebrate groups (phyla)have in the
Q29: Lancelets belong to the subphylum _.
Q30: The skeletal rod found in all chordates
Q31: The lancelet reproduces
A)by asexual processes alone.
B)by budding.
C)sexually
Q32: "Sea squirts," the most common kind of
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