The gills 0.0 / 5 ? zoologyEnvironments AdaptationUniversityAll boards Created by: SmalishCreated on: 10-02-17 22:40 The respiratory sytem of protists, sponges and cnidarians are essentially not... specialized 1 of 9 Echinoderms are known to have a skeleton made of ... calcium 2 of 9 They don't have true respiratory organs, but they have small dermal "gills"... echinoderms 3 of 9 Specialized respiratory organs have the advantage of mainly increasing... the surface exchange 4 of 9 Some marine annelids may use their respiratory organs for another purpose... nutrition 5 of 9 Considered as the most primitive gills and "penne"-shaped, they are... external gills 6 of 9 External gills mostly found within (clade)... invertebrates 7 of 9 Musclous axis composed of thin membranes... external gills 8 of 9 From which layer external gills originates ? ectodermic 9 of 9
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