Can racial categories be determined by biological traits?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

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.

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous