How did O2 levels affect the size of living things? Also, what have humans recently used the vegetation from this time period for?

Which element provides strength to the exoskeleton of clams and oysters

What noticeable trend from this graph might be used to make a conclusion?

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.