Which organ system is segmentally arranged in annelida?
a. circulatory
b. excretory

Question

trancenova · Answer

Well it would have to be circulatory as the excretory system is 'along' the worm ie. 'mouth' at one end and the anus at the other. Does that make sense?

anonymous · Answer

Um what about nephridia then?

anonymous · Answer

With all due respect, Im afraid TranceNova is way off here. Mouth and anus DO NOT constitute the excretory system- they are part of the alimentary canal (digestive). Excretory is the right answer. http://www.google.com/imgres?q=earthworm+excretory&um=1&hl=en&client=firefox-a&hs=W77&rls=org.mozilla:en-US:official&biw=1326&bih=633&tbm=isch&tbnid=XZ1CwyaZRhJ-1M:&imgrefurl=http://www.transtutors.com/biology-homework-help/earthworm/excretory-system/&docid=jmucB4qj4Sx44M&w=339&h=268&ei=SdtsTpiQJ8OSgQezxfWeBg&zoom=1&iact=hc&vpx=1032&vpy=255&dur=377&hovh=200&hovw=253&tx=198&ty=85&page=1&tbnh=145&tbnw=183&start=0&ndsp=17&ved=1t:429,r:10,s:0

trancenova · Answer

Ahh, I see, glad you're here otherwise we would have both been thinking the wrong thing!