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iskljucivo zive u morima najcesce na dnu mora
imaju izrastaje u vidu bodlji
krecu se 1.puzeci po morskom dnu
2.zariveni u morski pesak
3. sesilni organizmi
donja strana tela/ usni otvor
gornja str tela/ analni otvor
petozracna simetrija
otvoren krvni sistem
imaju UNUTRASNJI KRECNJACKI SKELET / izgradjen od nizova krecnjackih plocica
bodlje sluze za odbranu od nepijatelja
krecu se pomocu sistema vodenih nozica ispunjenih tecnoscu zavrsavaju se sa pijavkama
nervni siste izgradjen od tri nervna prstena / DIFUZNO-VRPCAST NERVNI SISTEM
slabo razvijeni culni organi
nemaju organe za izlucivanje
polno se razmnozavaju
larve imaju dvobocnu simetriju
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