Which of the following statements is false?
a. All vertebrates have a ventral tubular nervous
system.
b. All vertebrates have a tail at some stage in their
life cycle.
c. All vertebrates have a notochord at some stage
in their life cycle.
d. All vertebrates have pharyngeal gill slits at some
stage in their life cycle.
e. None of these are false.
Answer: a
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A vein always carries:a
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