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(C) Crab,scorpion,centipede,and prawn all belong to the phylum $Arthropoda$.Key characteristics of the phylum $Arthropoda$ include:$1$. They possess j

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Jointed appendages and chitinous exoskeleton

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(C) Crab,scorpion,centipede,and prawn all belong to the phylum $Arthropoda$.Key characteristics of the phylum $Arthropoda$ include:$1$. They possess jointed appendages ($Arthro$ = joint,$poda$ = foot).$2$. Their body is covered by a tough,chitinous exoskeleton.$3$. They have a segmented body.$4$. They possess an open circulatory system.Option $A$ is incorrect because three pairs of legs are characteristic of $Insecta$,not all arthropods.Option $B$ is incorrect because not all arthropods have two pairs of antennae (e.g.,insects have one pair).Option $D$ is incorrect because not all arthropods have a cephalothorax or a tracheal system (e.g.,crustaceans use gills).Therefore,the most common feature among these is the presence of jointed appendages and a chitinous exoskeleton.

Which of the following characteristics is common to crab,scorpion,centipede,and prawn?

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$A$: Chitinous exoskeleton is a characteristic feature of arthropods.
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