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identify the phylum and class of the specimen depicted in the following micrograph.
Phylum Cnidaria, class Hydrozoa


What is the function of the structure indicated by line A?
Feeding


Identify the structure indicated by line B.
Gonangium or reproductive polyp


How many tissue layers does this organism have?
2


On the figure, label the following structures: primary septum, secondary septum, ostium, tentacles, and pedal disc.


What is the function of the structure indicated by line C?
Defense


Identify the space indicated by line D.
Pharynx
