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Answer:
porifera
Explanation:
multicellular organism that is tissue system is absent
sessile that is the organism is attached to a substratum like structure
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Answer:
PORIFERA......
Sponges are unusual animals in that they lack definite organs to carry out their various functions. The most important structure is the system of canals and chambers, called a water-current system, through which water circulates to bring food and oxygen to the sponge.
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