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1) Why might it be evolutionarily advantage for Porifera bodies to include many opening with canals?...

1) Why might it be evolutionarily advantage for Porifera bodies to include many opening with canals?

2) Descibe two evolutionary advantages provided by Cnidocytes with nematocysts in Cnidaria?

3) Cnidarian have a gastric cavity filled with water, which acts as a hydrostatic skeleton. How does a hydrostatic skeleton work?

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