I’m taking a test at the moment, but i’m confused mainly on this question. can anyone help?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

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.

What is true of metabolism in its entirety in all organisms?