For example, oxygen is released by plants and humans relay it into carbon dioxide which gets turned back into oxygen
A statistical measurement of the average time a
person is expected to live is a life expectancy and it depends on many factors.
<span>These days we see some improvement in life
expectancy, this is because now medical health care has been improved. Death
rates from infectious diseases have fallen and life expectancy his improved and
the second thing is a healthy life style is very important for the improvement of life expectancy.</span>
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I think it's correct but I'm not 100 percent sure
