Why do bruises keep coming back in the same place all the time?

How many people drive vehicles in the world? Can a black person turn white? I missed a period i am 5 days late and i have took 4 tests and they were all negative i don't feel pregnant and my husband thinks i am.i have regular periods but i just want to no what is wrong? How is your stomach able to digest the food you eat? Is true about skin bones muscles the heart and intestines? Where is the spheniod bone? Is it bad if you ovulate every day? When muscle receives a nerve signal it and pulls on a tendon? Which part of the nervous system is a gray wrinkly organ made up of millions of neurons? How do you stop itching if you have posion? Why do neologism develop? What describes the value of seeking counseling for stress? How do kidney stones affect the urinary system? How many people commit suicide each year because of homophobia? What happens if antibodies not present or damaged? Can you have soy sauce when pregnant? Where does the pulmonary vein move blood to and from? Why does my one eye water while I'm eating? Will there one day be a cure for all cancer? What does involuntary terminated mean?