Final answer:
Sea stars demonstrate pentamerous radial symmetry which allows them to reproduce asexually through fragmentation and regenerate lost limbs, potentially leading to population increases when attempts at physical control are made.
Step-by-step explanation:
The pentamerous radial symmetry of Sea Stars, or Asteroidea, results in asexual reproduction through fragmentation. This remarkable feature allows a sea star that loses a limb to not only regenerate the lost part but also allows the detached limb to potentially grow into a new individual. Regeneration capabilities in sea stars are so robust that fisheries workers have found cutting sea stars in half to control populations can backfire, as each half can regenerate, effectively doubling their numbers.