The first public water supplies and sewers were established during the time of the
a.)prehistoric hunter-gatherers
b.)early cities
c.)greek and roman empires
d.)middle ages

the answer is b its not mature

the ecg findings of an acute anterior myocardial infarction wall include: st segment elevation in the anterior leads (v3 and v4) at the j point and sometimes in the septal or lateral leads, depending on the extent of the mi. this st segment elevation is concave downward and frequently overwhelms the t wave.

explanation:

frequency is the answer