Why can starfish regrow their arms?
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Answer: Special stem cells throughout body
Special stem cells throughout body ✓ — Correct! Starfish have stem cells distributed throughout their bodies that can become any cell type. When an arm is lost, these cells multiply and differentiate to rebuild the entire limb—some species can even regrow from just one arm!
Arms aren't vital organs — Wrong. Arms actually contain important organs in starfish! Each arm has digestive glands and parts of the nervous system. They regenerate due to stem cell abilities, not because arms are unimportant.
Seawater promotes healing — Wrong. Seawater doesn't promote regeneration. The ability comes from starfish having stem cells that can transform into any tissue type needed for regrowth.