|
Dr. Nesse related many facts about evolution, showing
that apparent "advances" had constraining limitations and some odd or "poorly
designed" body features had commensurate gains. His talk seemed focused
toward students who would be teaching biology in grade school and high
school.
|
 |
The polar bear is white -- a trait obviously evolved to help it not
be seen by the seals it hunts and eats -- but what about the cold?
In the artic, wouldn't it be unadaptive to be white and reflect
sunlight and heat?
It turns out that the polar bear actually has BLACK skin and the hair
is not white but translucent, so the light is channeled to the skin for
warmth and still makes the bear look white. |
|