Extinction is when a species of any animal, plant or creature is no longer found alive.
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Cartilage is a firm, flexible, connective tissue which is a type of protein that is found in many places including the human nose.
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Symbiosis is two completely different organisms living together and usually benefitting each other.

Calcium Carbonate is found in nature in the form of calcite, chalk and limestone. It can be used in the production of cement, houses, pools, and various durable structures.

Silica is a form of silicon and is found as quartz and sand flint. It is used in the production of glass, ceramics and abrasives.
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Alginic acid is a salt derived from an acid which is found in the cell walls of various kelps (seaweed).

Iodine is a nonmetallic element often used in medicine as an anticeptic.

Goiter is an enlargement of the thyroid gland on the front and sides of the neck.
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Mucopolysaccharide is a type of polysaccharride

Polysaccharride is better known as sugar because it is made up of many molecules of glucose.
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For more information on starch go to Natural Polymers page.

Mesoglea is a gelatinous material found inbetween the outer and inner cell walls of Phylum Coelenterata.
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Polymer is a chemical compound that has a high molecular weight and is very, very large.
For a better understanding of polymers go
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