state two characters of the following phyla and give one example of the phyla
a) porifera
b) cnidaria
c) platyhelminthes
d) Nematoda
e) Annelida
f) Arthropoda
g) Mollusca
h) Echinodermata
2) Differentiate between flatworm and round worms
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Characteristic Features of Phylum Porifera
They are generally marine aquatic organisms, with a few freshwater species.
Their bodies are asymmetrical.
Body shape can be cylindrical, vase-like, rounded or sac-like.
They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer.
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