What are agent that a change in the
activity of a structure

Mini dentist offices prefer preset trays because the use of these trays

Victoria enjoys laughing with her friends as they walk around the track after school which best describes her heart rate during this activity

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.