What are gull shells made out of?
carbon polymorphs To protect themselves calcium carbonate the mass of the object microorganisms scales or plates multinucleated cells materials
A B C D E F G H
What are gull shells made out of? (A) carbon polymorphs (B) To protect themselves (C) calcium carbonate (D) the mass of the object (E) microorganisms (F) scales or plates (G) multinucleated cells (H) materials