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.
Grizzly bears are specially adapted to survive the changing seasons. During warmer months, they eat a massive amount of food so they can live off body fat during the winter, when food is scarce. They may intake 40 kg (90 lbs.) of food each day, gaining over 1 kg (2.2 lbs.) of body weight a day.