The group of macromolecules that serves as the main source of energy for livings things is

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

geologic time scale (for gradpoint) =)

answer;

medical directors

explanation;

medical directors grants and supervises the privilege or permission to use an aed on an ambulance.

other roles of a medical director includes;

-provide medical leadership, including coordination with local ems and 911 centers.

-provide guidance in equipment selection and deployment

-develop guidelines for responder actions

-oversee medical care that is rendered through the program, including review of all responses to medical emergencies

-ensure appropriate initial training and skill maintenance

-assume overall responsibility for the conduct and operation of all patient care related activities