Seashells are the exoskeletons of mollusks such as snails, clams, oysters and many others. Such shells have three distinct layers and are composed mostly of calcium carbonate with only a small quantity of protein--no more than 2 percent. These shells, unlike typical animal structures, are not made up of cells

Horses are muscular animals with a long tail made up of coarse hair, a long, thick neck draped with a mane down the midline, and an elongated head and skull.

They contain pressurized carbon dioxide and nitrogen and propel it as a stream of fire squelching agent to the fire. Other extinguishers may contain a powder such as potassium bicarbonate (KHCO3), liquid water, an evaporating fluorocarbon, or the propelling agent itself.

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