Which of the following characteristics is mainly responsible for the diversification of insects on land?

Which organism possesses an open circulatory system?

Millipede $(Julus)$ and Centipede $(Scolopendra)$ are both included under:

Peripatus is a connecting link between which of the following?

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

Which of the following is an important distinguishing feature of a butterfly and not a moth?