Are Red Blood cells the only cell you need

No, they are not the only cells you need.

Explanation:

You also need white blood cells, which are the cells that help your body fight off infections, viruses, and more. If there were no white blood cells in your body, you would be unable to fight off bacteria or pathogens, making your body vulnerable to diseases and more. It wouldn't be too long until it'd kill you.

football or basketball players.

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.