Planarians lack dedicated respiratory and circulatory systems. this deficiency does not cause a problem because . planarians lack dedicated respiratory and circulatory systems. this deficiency does not cause a problem because . they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm their body cavity, a pseudocoelom, carries out these functions their flame bulbs can carry out respiratory and circulatory functions none of their cells are far removed from the gastrovascular cavity or from the external environment

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07-04-2018
Biology

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Planarians lack dedicated respiratory and circulatory systems. this deficiency does not cause a problem because . planarians lack dedicated respiratory and circulatory systems. this deficiency does not cause a problem because . they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm their body cavity, a pseudocoelom, carries out these functions their flame bulbs can carry out respiratory and circulatory functions none of their cells are far removed from the gastrovascular cavity or from the external environment

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jamuuj jamuuj · Answer 1 · 2018-04-16T14:57:45+02:00

I think the deficiency of dedicated respiratory and circulatory systems in Planarians does not cause a problem because none of their cells are far removed from the gastrovascular cavity or from the external environment. Planarians are free-living flatworms and form the class Turbellarians in the Phylum Platyhelminthes. Flatworms have three tissue layers, that is the ectoderm, mesoderm, and endoderm.

Аноним Аноним · Answer 2 · 2018-04-16T20:31:56+02:00

Аноним Аноним

16-04-2018

respiratory and circulatory system

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