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 facts. 1  Aerobic exercise is sometimes known as cardio- exercise that requires pumping of oxygenated blood by the heart to deliver oxygen to working muscles. 2  Aerobic exercise stimulates the heart rate and breathing rate to increase in a way that can be sustained for the exercise session.