Answer:
about 70
Explanation:
At least 69 of these chemicals are known to cause cancer, and many are toxic.
Physical fitness would be the answer. In order for you to walk, you have to be well enough to walk, For instance, you need to be in shape to walk. Some people are so overweight that that they need a wheel chair just to get around and are an extreme example of what it is not to be physically fit. Regular exercise should help you avoid this predicament.
Knowing planes, body positions, directions and such can help people locate areas on the body more easily and precisely. One occupation could be a forensic pathologist who need to identify main points of interest on a body
Answer:
The volume of the thoracic cavity increases. pressure in the alveoli increases. the diaphragm contracts and pushes upward on the chest cavity