Polar bears are in danger of extinction in the future if globalwarming continues, as their habitat, Arctic sea ice, is shrinkingevery year, making it difficult for bears to have enough food tolast through the lengthening summers.With a population of nearly 25,000, the polar bear is not in dangerof extinction now.
1 In general, anything that is good for your heart is great for your brain. 2  Aerobic exercise is great for body and brain: not only does it improve brain function, but it also acts as a first aid kit on damaged brain cells.
Aerobic exercise improves the volume of oxygen your body can take in and use to fuel aerobic functions of your body. Activities include aerobic metabolism and cardiovascular exercise. Aerobic literally means with air, and the most biologically important to survive is oxygen. Therefore aerobic means with oxygen.