Life expectancy is the average age at death of the entire live-born population.In the middle of the nineteenth century,life expectancy in North America was 40 years, whereas now it is nearly 80 years.Thus ,in those days ,people must have been considered old at an age that we now consider the prime of life. C. Many of the people who live to an advanced age today do so only because of medical technology that was unknown in the nineteenth century. C supports rather than weakens the argument? and whether the meaning of argument and conclusion is the same? |