List the six categories of teen risk behaviors for which information is gathered in the youth risk behavior survey

The part of the nephron provides initial filtering of the blood in the urinary system.

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.

Summarize four pregnancy-prevention methods. discuss the benefits effectiveness and risks of each