Unformatted text preview: vival of the fittest. Life expectancy (Years) -natural selection optimizes reproductive fitness. strength and health may be part of reproductive fitness, but
natural selection don't care. it only cares about survival of genes. 80
40 World Population
Dec 31, 2013 10:55 PST
(www.census.gov) -but an important question to ask would be "is long life part of reproductive strategy in human?"
-well, the answer is no. the graph show that starting at 1800s, life expectancy is around 30. then life expectancy
dramatically increase probably due to nutrition, hygiene, and medical advances (such as antibiotics). but this 200
years is just 1% of the time our species exist.
-life expectancy of our ancestor is the same in pre-revolutionized france at 1800s, about 25-30 years old.
-most of the organelle functions/disease we will discuss occur in middle or advance age.
-most people in the past do not live long enough to run risk of cardiovascular disease
-the traditional life span of human make sense when you look at human fertility: turkey's women bare children
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