Which sequence correctly shows increasing structural complexity with respect to body cavity organization?
AAcoelomate $\rightarrow$ pseudocoelomate $\rightarrow$ true coelomate
BPseudocoelomate $\rightarrow$ acoelomate $\rightarrow$ true coelomate
CTrue coelomate $\rightarrow$ acoelomate $\rightarrow$ pseudocoelomate
DDiploblastic $\rightarrow$ triploblastic $\rightarrow$ blastula
Answer & Solution
Correct answer: A. Acoelomate $\rightarrow$ pseudocoelomate $\rightarrow$ true coelomate
Acoelomates lack a body cavity, pseudocoelomates have a cavity not fully lined by mesoderm, and true coelomates have a cavity lined by mesoderm on both sides. Thus the progression of increasing complexity is acoelomate to pseudocoelomate to true coelomate.
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