Why do your muscles and other parts of your body need oxygen?

Describe three ways in which technology has treat the flu

In a two to three page paper, examine the history and development of the healthy people initiatives. discuss some of the successes and shortfalls of the three initiatives thus far; including healthy people 2000, healthy people 2010, and healthy people 2020. be sure to include statistical data from the initiatives to support your position. don't forget to cite your sources.

Why would one lymph node in the neck be swollen and not the other? what causes them to swell?