Which statement best describes a galaxy? F: A cloud of gas that is the birthplace of stars
G: A system of billions of stars, gas, and dust held together by gravity
H: A ball of plasma that experiences nuclear fusion in its core
J: A mass of dust and ice that orbits a star in an elliptical pattern

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.