Starfish , or sea stars, are brilliant and resilient ocean creatures. These bottom-dwelling echinoderms have a central disc body covered in tough calcium carbonate skin that helps provide support and protection for their vital organs and complex circulatory system.

Starfish are so resilient that they can even regenerate lost arms. If a predator gets lucky and successfully bypasses a starfish's tough skin and muscles, the severed arm seals itself, and special cells migrate to the location to start growing a new limb.

These intriguing sea animals also reproduce asexually using a different regeneration ability called binary fission. Binary fission occurs when organisms divide their cells into two genetically identical daughter cells. These eggs are then mixed with sperm released into t

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