Diatomaceous Earth Is Used in an Amazing Variety of Ways

Diatomaceous earth is used in an amazing variety of ways.It can be a filtration aid in fish tanks,mild abrasive in toothpaste and metal polishes,insecticide,absorptive for liquids,filler in plastics and rubber,kitty litter,porous support for chemical catalysts,stabilizing component of dynamite,and insulation.This versatile product is actually the fossilized remains of eukaryotic,unicellular,photosynthetic organisms that contained a high amount of silica in their cell walls.These fossilized diatoms were once living examples of ________ from the kingdom ________.

A) Euglena; Plantae
B) bryophytes; Protista
C) algae; Protista
D) Amoeba; Plantae