In the evolution of animal kingdom, the first animals with true body cavity belong to the phylum

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Q: 44 (IES/2003)
In the evolution of animal kingdom, the first animals with true body cavity belong to the phylum
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question_subject: 

Science

question_exam: 

IES

stats: 

0,13,56,13,30,8,18

keywords: 

{'arthropoda': [0, 0, 2, 0], 'first animals': [0, 0, 1, 0], 'true body cavity': [0, 0, 1, 0], 'platyhelminthes': [1, 0, 0, 0], 'annelida': [2, 0, 1, 1], 'phylum': [0, 0, 0, 1], 'animal kingdom': [1, 1, 1, 1], 'aschelminthes': [1, 0, 1, 0], 'evolution': [1, 0, 1, 0]}