In 1798 the first smallpox vaccine was developed.Over the 18th and 19th centuries,systematic implementation of mass smallpox immunization culminated in its global eradication in 1979.
The stress is coming from the daily activity
The answer would be D because the proportion is 6:9, which could be simplified to 2:3
Motor oil or house paint is what needs special handling. i just usually throw away batteries. but i think the right answer is motor oil. it can effect the earth or ground water. <span />
