Smoking is very unhealthy. It shortens your life by 7 minutes for every cigarette you smoke, it costs about $2,000 per year, it makes your teeth yellow and your clothes smell, and it?s addictive so people can't quit. Taking drugs is addictive too. It costs even more money than cigarettes, makes it almost impossible to get good grades or play sports, and can get you really sick. People who continue to take drugs often die young from taking them.
There are lots of good exercises. An easy one is walking at least 20 minutes every day. But swimming and team sports are all good. Stretching is another exercise that is good for you just before you exercise and right afterward. Any exercise you do regularly will work.
When babies are born they have over 300 bones. But as they grow up, some of the bones join together into one larger bone. An example is the skull. The skull bones are not joined together in children so there is room for the brain to grow. Once we stop growing, the total number of bones is 206.
The blood is made up of red blood cells and white blood cells. The red blood cells take oxygen to every other type of cell in our bodies. The white blood cells help to fight infections.
