1. a flexible, supporting structure found only in chordates is the a. nerve net b. notochord c. pharyngeal slits d. dorsal fin. 2. ancient chordates are thought to be most closely related to which of the following species? a. spiders b. earthworms c. octopi d. sea stars

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1. a flexible, supporting structure found only in chordates is the a. nerve net b. notochord c. pharyngeal slits d. dorsal fin. 2. ancient chordates are thought to be most closely related to which of the following species? a. spiders b. earthworms c. octopi d. sea stars

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The notochord is a flexible, supportive structure found only in chords. The correct option among all the options given in the question is the second option or option “B”.

Ancient chords are believed to be closely related to sea stars. The correct choice among all the options given in the question is the last option or option “D”.