Which of these describes a nebula? A) A collection of hot gases that sometimes produces light from nuclear reactions.

B) A collection of dust and gases that is found near stars.

C) A collection of hot gases that results from stars that have exploded.

D) A collection of dust and gases that forms stars or results from dying stars.

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.