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In the give diagram, typical chordate plan is given. Identify A and B.
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Nerve cord and notochord
Members possess 3 fundamental chordate characters at any stage of life :
Notochord - Solid, mesodermal and later on develop into vertebral column.
Dorsal hollow nerve cord (or dorsal tubular nerve cord or neural tube) - Hollow, ectodermal and later on develop into CNS (central nervous system).
Pharyngeal gill slits.
- Bilaterally symmetrical, organ system level, triploblastic and eucoelomate.
Notochord - Solid, mesodermal and later on develop into vertebral column.
Dorsal hollow nerve cord (or dorsal tubular nerve cord or neural tube) - Hollow, ectodermal and later on develop into CNS (central nervous system).
Pharyngeal gill slits.
- Bilaterally symmetrical, organ system level, triploblastic and eucoelomate.
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