HELPING THE OTHERS REALIZE THE ADVANTAGES OF SPIDER

[16] Even so, in spiders, it occupies just the upper Element of the abdomen, and blood is discharged into the hemocoel by a single artery that opens for the rear end in the abdomen and by branching arteries that pass through the pedicle and open into many parts of the cephalothorax. That's why spiders have open up circulatory units.[thirteen] The b