Sources for alginic acid, a thickening, emulsifying agent found in ice cream, toothpaste, pudding and cosmetics, are the ____.

A) seed plants
B) ferns
C) brown algae
D) red algae
E) green algae

Alginic Acid

A polysaccharide distributed widely in the cell walls of brown algae, used as a food thickener and pharmaceutical ingredient.

Brown Algae

A large group of mostly marine, multicellular algae, including many seaweeds commonly found in colder waters.

Emulsifying Agent

A substance that helps to mix two immiscible liquids, such as oil and water, to form a stable mixture called an emulsion.