Q.
In Arthropoda, head and thorax are often fused to form cephalothorax, but in which one of the following classes, is the body divided into head thorax and abdomen?
Body in arthropoda is segmented. Segments are grouped into 3 forms - head, thorax and abdomen. When head and thorax are fused then they are referred to as cephalothorax. Class insecta of arthropoda phylum have body divided into head, thorax and abdomen.