Developed world have it later but went through the

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growth but happen earlier. Developed world have it later but went through the same process. Stage 1Birth & Death rates are high. Population is low & stable.-Birth rates = Death rates, Population level is stable.-Birth rates >Death rates, population will grow-Birth rates<Death rates, populations will shrinkStage 2Death Rate are decreasesBirth Rate remain highPopulation growthStage 3Birth Rate DecreasesPopulation growth slowsStage 4Birth=Death RateParents switch to quality from quantity specific because of this transition. Huge debate:Biological: Humans reproduce like this exactly Cultural: humans are not like other animals, we have cultural world like education. December 3, 2013Why not live forever? -All the cheaters take over and have the kids and the nice people allow that to happen and not get the opportunity to reproduce and have kids. That’s why being nice doesn’t work evolutionary.-overpopulationDisposal Soma theory – from an evolutionary point of view, your body is vessel of reproductionYour body will rust and you should to spend time on maintenance or reproduction.Reason we die: Things inherently degrade overtime. If organism finds itself in a situation where the environment s changes and the average age of death is shorten, the natural select will allow them to mature quickly and have more offspring.Primates and Apes are above the trendline so they die old according to their body mass. Humans have exceptionally long lives twice as long as other Apes.
WHY: Long Post-Reproductive Life (for Women)Humans live a long after we stop reproducing. Humans invest in maintenance & reproduction so that maximize your offspring. Due to the benefits: older women help their younger kids to bring up their grandchildren. This is so important that we actually increase our lifespan so we can continue to share food after we stop reproducing ourselves. Grandfather’s hypothesis. Traditional populations: families do better with grandparents than with families without grandparents. Food sharing is the main reason, why humans live so long.From biology point of view, mothers know who their kids are but not their fathers. Situation: No good access to medicineAverage life span: Long lives are ancient. Humans outliving apes.-->Long lives are not due to modern medicine. They help out children to survive childhood diseases.Hominins have been living into “Old Age” for at least 100,000 yrs. December 6, 2013Primates only burn half the calories of other animals’. There is no difference in energy expenditure between animals who live in wild than primates living in capacity. Human Difference is ~2,500 kcal/day (Equivalent to a daily marathon)If primates are only spending half the calories, their rate of reproduction is slowed down. Low rate of reproduction, low rates of growth, this is due to their energy expenditure.Metabolic Prediction:Aging = Cellcular Metabolic Rate, or DEE/MassSenescence due to Accumulated Metabolic DamageSlower the metabolic rate, the slower you ageCalorie RestrictionCut down the calories (25% less food)Result: thinner, but 80% chance of living old ageEats whatever he wantsResults: look hairer, but 50% chance of living old age

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