Long ago, people thought that lightning never struck the same place twice. Over time, our understanding of weather events has changed a lot. Give at least two reasons why our understanding of lightning might have changed so much.

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.