Concerning tissue complexity how different are cnidarians from poriferans?

Concerning tissue complexity how different are cnidarians from poriferans?
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Cnidarians have true tissue differentiation, they present distinct organized tissues in the body. Poriferans present only some dispersed specialized cells with no tissue differentiation.
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Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

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Poriferans and cnidarians do not have excretory systems. Do platyhelminthes have an excretory system?

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Concerning digestion how are poriferans characterized?

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What are the two main morphological patterns of cnidarians? Concerning locomotion how do these forms differentiate from each other?

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How is the nervous tissue distributed in cnidarians?

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What are the main cells of which poriferans are made?

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What is the typical shape of poriferans?

Description : What is the typical shape of poriferans?

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In case of poriferans, the spongocoel is lined with flagellated cells called (a) oscula (b) choanocytes (c) mesenchymal cells (d) ostia.

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In case of poriferans, the spongocoel is lined with flagellated cells called: (1) oscula (2) choanocytes (3) mesenchymal cells (4) ostia

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The cylindrical body form of cnidarians is called? -Biology

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How do cnidarians give birth?

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What is is the most common form of behavior in simple animals like cnidarians worms?

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What are the body plan of cnidarians?

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How does a cnidarians reproduce?

Description : How does a cnidarians reproduce?

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Is the nervous system in platyhelminthes more or less sophisticated than in cnidarians? What are the main neural structures found in flatworms? How is this neural organization important for the diversity of biological niches explored by species of the phylum?

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