1 â¢ Ozone (O3) is an extremely reactive gas molecule composed of three oxygen atoms. â¢ 2  Ozone forms in chemical reactions in the atmosphere when nitrogen oxides (NOx) and volatile organic compounds (VOCs), also called hydrocarbons (HC), come into contact with both sunlight and heat. â¢ Ozone (O3) is an extremely reactive gas molecule composed of three oxygen atoms. â¢ 2  Ozone forms in chemical reactions in the atmosphere when nitrogen oxides (NOx) and volatile organic compounds (VOCs), also called hydrocarbons (HC), come into contact with both sunlight and heat.
Grolar bears. The offspring of a grizzly bear and a polar bear, a grolar bear is one beast you don't want to meet in the woods. Interestingly, unlike many hybrid animals on this list, grolar bears are known to occur naturally in the wild.
In North America, grizzly bears (Ursus arctos) once ranged from the Pacific Ocean to the Mississippi River and from Central Mexico to the Arctic Ocean.rizzly bears have one of the lowest known reproductive rates of all North American land mammals. The age of first reproduction ranges from 5-8 years. A female produces young every 3-5 years. In the mountain parks, research indicates that on average, female grizzly bears have offspring every 4-5 years.