What is the nature of chromosomes that align themselves on the metaphase plate in metaphase i?
a. pair of sister chromatids facing opposite poles
b. pair of nonsister chromatids facing opposite poles
c. pair of tetrads facing opposite poles

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.