'The skeleton of a starfish is made of this, CaCO3, just like chalk'
calcium carbonate
INVERTEBRATES: The skeleton of a starfish is made of this, CaCO3, just like chalk
The skeleton of a starfish is made of this, CaCO3, just like chalk
The skeleton of a starfish is made of this, CaCO3, just like chalk
INVERTEBRATES
calcium carbonate
INVERTEBRATES