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Nitrogen oxide
NOx is a generic term for the various nitrogen oxides produced during combustion. They are believed to aggravate asthmatic conditions, react with the oxygen in the air to produce ozone, which is also ... > more -
Polar Bear
The Polar Bear, aka white bear aka northern bear aka sea bear, is a large bear native to the Arctic. It is the largest land carnivore species and the apex predator within its range. It is ... > more -
Horse breaking
Horse breaking (or horse starting) refers to the process used by humans to get horses to let themselves be ridden or harnessed. Before such a learning process is accomplished, a horse will normally ... > more -
Ozone layer
The ozone layer is the part of the Earth's atmosphere which contains relatively high concentrations of ozone (O3). "Relatively high" means a few parts per million - much higher than the ... > more -
Zebra mussel
The Zebra mussel (Dreissena polymorpha) is a bivalve mussel native to freshwater lakes of southeast Russia. Zebra mussels are currently causing serious problems in North America and Sweden, where ... > more -
Immune system
The immune system is the system of specialized cells and organs that protect an organism from outside biological influences. (Though in a broad sense, almost every organ has a protective function - ... > more -
Common Seal
The Harbor Seal or Common seal (Phoca vitulina) is a true seal of the Northern Hemisphere. Having the widest range of all pinnipeds, Harbor seals are found in coastal waters of the northern Atlantic ... > more
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