What is present in crustaceans but not in \( \mathrm{P} \) insects? (1) Paired limbs (2) Two pai...

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What is present in crustaceans but not in
\( \mathrm{P} \) insects?
(1) Paired limbs
(2) Two pairs of antennae
(3) Bilateral symmetry
(4) Chitinous exoskeleton
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