Introduce yourself to the class by stating three facts about the musculoskeletal, respiratory

1) respiratory system is made of the windpipe lungs diaphragm alveoli takes in oxygen and waste

2) breathing allows you to take in the oxygen your cells need and expel carbon but when you breathe you loose water.

3) the lungs are the only organs that can float on water bc it is holding 300 million ballon like structure called the alveoli

Explanation:

correct worked

answer; /// i believe that the correct answer is (d); /// alternate walking and running;

put a penis in a vagina