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Complete the analogy
Platyhelminthes : Triploblastic acoelomate : :
Coelenterates : _________
Solution:
Platyhelminthes are characterized by being triploblastic (having three germ layers: ectoderm, mesoderm, and endoderm) and acoelomate (lacking a true body cavity). Coelenterates (also known as Cnidaria) are simpler organisms that are diploblastic (having two germ layers: ectoderm and endoderm) and also acoelomate (lacking a coelom). Therefore, the correct completion of the analogy is 'Diploblastic acoelomate'.