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.
They also behave much more like polar bears, stamping on some objects and hurling others, actions that polar bears use frequently in the wild. Of the nearly twenty grolar bears known to exist, only one was found in the wild, as polar bears and grizzly bears have generally exclusive habitats. The scientists are waiting to determine if the female hybrid is fertile, which would suggest that a hybrid population could exist in the wild were the bearsâ habitats to overlap more in the future.