Dinosaurs died off during a mass extinction because .
A. they were hit by a giant asteroid
B. the ocean level rose and they drowned
C. a climate change caused plants to die
D. volcanic eruptions engulfed them in lava flows

Which of these is a symptom o anorexia nervosa

What is a common risk associated with alcohol?

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.