What is the main organ of the respiratory system ?

Does anyone know how to dissect a frog or baby squid?

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.

Which of the following can be a community opportunity to play a team sport? basketball hang gliding hiking rollerblading which of the following breaks a safety rule? going to the gym while you have a contagious condition, like the flu or pink eye ignoring people who have been waiting to use your basketball court talking on your phone or texting during a yoga class walking out of a fairway sand trap without raking your footprints