A learner makes a note: a comb jelly shows features of both radial and bilateral arrangement around its body axis. The missing scientific idea is:

Correct Answer: C

biradial symmetry

Ctenophores are commonly described as biradial because their body plan combines radial organization with paired structures. This distinguishes them from typical radial cnidarians. This MCQ belongs to the Ctenophora topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.