Sponges ________.
A) have larvae which are motile and move via the motion of cilia
B) are the simplest diploblastic animals
C) exhibit bilateral symmetry
D) have a nerve net but not a central nervous system
E) have feeding cells called spicules

Question

Quizplus · Accepted Answer

Sponges have larvae that are motile and move via the motion of cilia. This is a key feature in their life cycle, allowing the dispersal of the species. Sponges are actually considered to be among the simplest of multicellular organisms, but they are not diploblastic (they lack true tissue layers), do not exhibit bilateral symmetry (they are asymmetrical), do not have a nerve net (they lack true nervous systems), and their feeding cells are called choanocytes, not spicules (spicules are structural).