Is it normal for my menstrual cycle to be 3 days long? I'm just wondering because it's been like this for the past two or three years, every time I've asked the doctor they always say it's normal but... So I just kind of needed other people's opinions . I will say my family does have a history of endometriosis oh, so I don't know if that would have something to do with it or not IP​

Which of the following identifies a main culprit for america’s increasing weight gain

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.

China was the world's leading steel producer in 2006. what changes would you expect to be taking place in china?