A diagram in the course handout shows that after fertilization in many cnidarians, a ciliated larval stage swims before settlement. Identify the related structure or process.

The planula is a ciliated larval stage in many cnidarian life cycles. It swims for a period and then settles to form a polyp in suitable conditions. This MCQ belongs to the Cnidaria topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.