Which option correctly matches symmetry in echinoderms at different life stages?
AAdult bilateral, larva radial
BAdult asymmetrical, larva bilateral
CAdult radial, larva bilateral
DAdult radial, larva asymmetrical
Answer & Solution
Correct answer: C. Adult radial, larva bilateral
The principle is that echinoderms are an exception across life stages: adults are radially symmetrical, whereas larvae are bilaterally symmetrical. This is important because symmetry here changes with development. Option A reverses the stages. Options B and D are incorrect because neither adult nor larval echinoderms are typically described as asymmetrical in this context.
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