(A) In the phylum $Arthropoda$,the body is typically divided into three regions: head,thorax,and abdomen. In the class $Insecta$ (Hexapoda),the body i

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(A) In the phylum $Arthropoda$,the body is typically divided into three regions: head,thorax,and abdomen. In the class $Insecta$ (Hexapoda),the body is clearly segmented into these three distinct regions. In contrast,many members of the classes $Crustacea$ and $Arachnida$ exhibit a fused head and thorax,known as a cephalothorax.