A common characteristic of all vertebrates without \( \mathrm{P} \)...

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A common characteristic of all vertebrates without
\( \mathrm{P} \) exception is

W
(a) the division of body into head, neck, trunk and tail
(b) their body covered with an exoskeleton
(c) the possession of two pairs of functional appendages
(d) the presence of well-developed skull.
(1994)
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