: Most species can regenerate lost arms; in some cases, a single separated arm can grow into a new sea star if part of the central ring nerve canal is attached. Ecological & Human Impact

: They lack a centralized brain but have a complex nervous system, including light-sensitive eye spots at the tips of their arms.

: Like all echinoderms, asteroids possess a unique network of internal channels used for locomotion, feeding, and basic circulatory functions.