Mr. Scott
Under the Amazing One's Wing
- Joined
- Nov 23, 2005
- Messages
- 2,546
The testes situation is key evidence of evolution rather than design. It's described quite well in the book "Your Inner Fish" by Neil Shubin.
Below is a drawing of the path sperm has to take from the testes to the penis. Notice how it goes up in front of the pelvic bone, then back, over a urine line, then back down. This would be insane design, not intelligent design. It passes that way because in cold blooded animals the testes are way up in the chest cavity. In order to allow warm bloodedness, the testes has to descend, during embryonic development, from the upper torso down below the penis into a cooler, dangling sack. The obviously random descent causes a hole in the abdominal wall that often results in the inguinal hernias we frequently suffer from. Evolution favors traits that yield passable advantages, usually not excellent designs. The advantage of warm bloodedness simply outweighs the disadvantage of the hernias and whatever other problems this path produces.
Below is a drawing of the path sperm has to take from the testes to the penis. Notice how it goes up in front of the pelvic bone, then back, over a urine line, then back down. This would be insane design, not intelligent design. It passes that way because in cold blooded animals the testes are way up in the chest cavity. In order to allow warm bloodedness, the testes has to descend, during embryonic development, from the upper torso down below the penis into a cooler, dangling sack. The obviously random descent causes a hole in the abdominal wall that often results in the inguinal hernias we frequently suffer from. Evolution favors traits that yield passable advantages, usually not excellent designs. The advantage of warm bloodedness simply outweighs the disadvantage of the hernias and whatever other problems this path produces.
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