cofty

Joined

• started 464 topics
• posted 24,957 times   see topics posted on
• send a message

Posts by cofty

• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Asked and answered.
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Well that is way off topic.

  I don't understand your question?

  Why do you think the mating habits of Garter snakes presents a challenge to evolution? How many species can you think of where the males compete for breeding rights?
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Why don't you just send your critique to the most qualified scientists in the USA at the National Academy of Sciences since they were the ones who peer-reviewed and published the paper.

  Be sure to tell them how you modelled heat loss based with varying time of day, fur covering and posture and why your results contradict Rixton & Wilkinson.

  I look forward to reading the retraction by the NAS based on your research.
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Yes and yes.
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  See this paragraph in particular..

  Specifically, our model predicts that once hair loss and sweating ability have evolved to near-modern human levels, a hominin could thermoregulate even under hot, sunny conditions and even when involved in something as energetically demanding as brisk walking. Further, our calculations make predictions as to how the evolution of such hair loss and sweating ability might be linked to daily behavioral patterns. Specifically, it is clear from the extremes of hairiness that we simulated that progressive hair loss (in the absence of specialist adaptations to maximize sweating ability) would have led to even greater risk of overheating in the heat of the day (compared with a hairier individual), but would have made it easier to have been active nearer dusk and dawn. This could have provided selection pressure for hair loss, combined with behavioral adaptations such that long-distance travel under hot, sunny conditions was constrained to occur only early and late in the day. Once hair loss and sweating ability have evolved increasingly toward near-modern human levels, this temporal restriction would have progressively decreased, until eventually such exercise was even possible (providing sufficient water was available to allow replenishment of reserves) in the hottest part of the day.
  
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Here click this link and read the whole paper by Ruxton & Wilkinson at PNAS...

  Avoidance of overheating and selection for both hair loss and bipedality in hominins..
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Shadow - Of course it would have taken you 30 seconds to find that study yourself if you had actually been interested in the answer rather than yet another failed "gotcha".
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  ..models that suggest humans started walking upright as a means to cool off aren’t looking at the whole picture because in addition to the metabolic heat generated, the cooling effect gained in losing body hair would be much more profound in a person walking upright, than would be the case for one who remained crouching.

  Thus, they argue, it was only after hominins started walking upright that they began losing their fur, though they do agree that the latter change came about as a means of keeping cooler.

  Read more at: http://phys.org/news/2011-12-early-humans-lost-fur-bipedalism.html#jCp
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  You didn't read it. The answer is really simple.

  You are being obtuse - as usual.

  Do lions and apes walk upright across the Savannah during the day? What happens if you do that? Does fur keep you cool in the sun or make you overheat?

  It's not a matter of opinion, it's about facts.

  Read the link.
• 
  87

  Evolution Gap - Where's the Fur?

  by shadow in

  1. watchtower
  2. bible

  evolution paints human ancestors covered with fur.

  fur has several benefits as stated by britannica "the pelts of fur-bearing animals are called true furs when they consist of two elements: a dense undercoat, called ground hair, and longer hairs, extending beyond that layer, called guard hair.

  the principal function of ground hair is to maintain the animal’s body temperature; that of guard hair is to protect the underlying fur and skin and to shed rain or snow.".

  1. 
  2. 
  3. 
• 

  cofty

  Then read this ...