In museum study, most sponge bodies cannot be divided into equal halves through a fixed plane. The specimen or feature is best linked with:

Many sponges are asymmetrical or only loosely organized in shape. Unlike bilaterians, they usually lack a definite anterior-posterior axis and true cephalization. This MCQ belongs to the Porifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.