Cual de los 3 sistemas del cuerpo humano se ven afectados por el c0vid19​

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.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.