Which of these activities is not related to the excretory 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.

During polarization, potassium has a blank charge, sodium has a blank ch arge ,and calcium has a b l ank. charge

What is a negative influence on community health? a: national health debt b: citizens who drive unsafely c: unreliable public transportation d: stores that sell tobacco to minors