Why is carbon considered tetravalent? a. since it has four electrons in its outermost orbital, it needs four more electrons to complete its octet. b. since it has two electrons in its outermost orbital, it needs four more electrons to complete its octet. c. since it has four electrons its outermost orbital, it can donate four electrons to complete its octet.

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.