In the open ocean, tiny micro-organisms called coccoliths (microscopic plants) and foraminifera (microscopic animals) live in surface waters and they too make their shells of calcium carbonate.
(tiny micro-organisms; called; coccoliths) (tiny micro-organisms called coccoliths (microscopic plants) and foraminifera; live; L:in surface waters; L:In the open ocean) (they; too make; their shells of calcium carbonate)
tiny micro-organisms tiny micro-organisms called coccoliths (microscopic plants) and foraminifera they
called live too make
coccoliths
L:in surface waters L:In the open ocean
their shells of calcium carbonate