0.388 Hope this helped let me know if it was wrong :)
Answer:
a spider has 4 pairs of legs, since they have 8 legs
excretory system: removes waste from blood.
respiratory system: obtains oxygen so the energy in the nutrients can be extracted.
circulatory system: transports nutrients from small intestine to the othet tissues.
nervous system: regulates and controls digestive functioning.
( Am not completly sure, but i think this is the answer)
To much gas has build up in them? I guess