Enda en kreasjonist-myte knust

Takk for at du deler denne bloggposten!
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  

Kreasjonistmyte:

We are surrounded by evidence of intelligent design. Take but one example: the suckling mechanism of the whale. The whale is a mammal which suckles its young underwater. It does so by means of a watertight cap around the mother’s nipple which fits tightly around the baby’s snout so as not to allow the entrance of sea water. Such a mechanism does not allow of a transitional form which adapts slowly to its environment. It does not allow for a gradual evolutionary process. It must exist perfectly formed for the purpose or the baby whale dies. How else could such a mechanism exist if not brought about by an intelligent and purposeful creative force?


Knusingen utføres av Dr Colin D MacLeod:

Joe Pieri claims (Letters, October 17) that a watertight cap around the nipples of whales that fits tightly around the baby’s snout to prevent sea water entering is a perfect illustration of intelligent design (ID) as any gradual transitional form would result in the baby whale’s death. If this is the best example a supporter of ID can muster, it only helps to illustrate how flawed this non-scientific idea is and why it has absolutely no place in the science classroom. First, as a whale biologist, I can say with some certainty that no such structure exists.

Baby whales use “fringes” around the edge of their tongue to help channel milk from the nipple to their thoats. This does not to prevent the entrance of sea water into the baby whale’s mouth, nor is it intended to, but only serves to reduce the mixing of sea water and milk. This leaves plenty of possibilities for functional transitional forms where the tongue is only slightly more fringed and, therefore, only slightly better at keeping the milk and sea water separate, making the milk less dilute and, therefore, beneficial to the calf as it gets more concentrated milk faster.

Secondly, there is no need for baby whales to prevent sea water entering their mouths as it will not kill them. Presumably, Mr Pieri thinks that the reason the baby whale would die if sea water entered the mouth is because it might get into the airway causing the animal to drown.

However, unlike humans, the windpipe of a whale sticks right through its oesophagous, completely separating the airway and the digestive tract (a requirement for all whales, whether adult or baby, as they need to be able to open their mouths underwater to feed) so there is no risk of drowning while nursing in baby whales. A similar, but not as complete, separation of the digestive tract and the airway is found in all young terrestrial mammals, including humans, to allow them to breath while nursing, and while adaptation is lost in older humans through a descent of the larynx, this basic mammalian separation has been enhanced by natural selection in whales because it is beneficial to their life in the sea. Incidentally, this positioning of the larynx through the digestive tract limits the size of fish whales can swallow because if the fish is too big it may displace the larynx and allow water into the airway, resulting in death.

In fact, whales are not uncommonly found washed up on the shore having died due to suffocation with large fish wedged in their throat, demonstrating that while this design works most of the time, it is far from perfect and certainly not evidence of any ID. Therefore, Mr Pieri’s “perfect” example for ID is a figment of his imagination based a poor understanding of biology and no facts.

Fant du noe feil i bloggposten? Gi meg gjerne beskjed via kontaktskjemaet eller kommentarfeltet nedenfor, så vil jeg korrigere feilen. Husk at du må spesifisere hva som er feil/upresist og hvorfor, helst med god dokumentasjon hvis relevant.


Vil du booke meg til foredrag om kritisk tenkning, vitenskapsformidling, sosiale medier eller annet? Ta en kikk på hva jeg kan tilby, mine tidligere oppdrag, og bookinginformasjon her!


Likte du dette? I så fall kan du støtte mitt arbeid ved å bli betalende medlem på Forum for Kritiske Tenkere for å få tilgang til mer ekslusivt innhold og hjelpe meg til å produsere mer av det jeg brenner for!


Takk for at du deler denne bloggposten!
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •