Which Phylum has the lowest structural organisation

for plants- thallophyta.
for animals-porifera 
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thallophyta
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tell specifically in plants or animals
in plants - thallophyta
in animals - porifera
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you were asking about phylum so it should be porifera and division belongs to plants in that case it will be thallophyta. please correct me if i am wrong
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porifera
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