In Arthropoda,the head and thorax are often f | vedclass

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(D) The correct option is $D$.In the phylum $Arthropoda$,the class $Insecta$ (or $Insecta$) is characterized by a body distinctly divided into three r

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Insecta

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(D) The correct option is $D$.In the phylum $Arthropoda$,the class $Insecta$ (or $Insecta$) is characterized by a body distinctly divided into three regions: head,thorax,and abdomen.In contrast,many other arthropods,such as those in the class $Crustacea$ and $Arachnida$,exhibit fusion of the head and thorax to form a $cephalothorax$.Therefore,$Insecta$ is the class where the body is clearly divided into these three distinct parts.

In $Arthropoda$,the head and thorax are often fused to form a $cephalothorax$. However,in which of the following classes is the body divided into head,thorax,and abdomen?

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