Match the year to its event in the history of environmental science.
1955
1968
1969
1970
paul ehrlich argued that overpopulation was responsible for environmental problems.
the first national earth day marked the largest demonstration in american history.
president eisenhower asked the public health service to study hays to control air pollution.
the santa barbara oil spill led to reforms in the energy industry.

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.