From Nathan H. Lents at Skeptic:
Even if ID offered intellectual gains over creationism through the principle of irreducible complexity, and a focus on observations rather than biblical scripture, it did little to explain how poor design could be so rampant in creatures that were specifically designed by an intelligent force. Therefore, glitches in nature, particularly in the human body, call out for an explanation. Evolution usually provides elegant and deeply informative explanations. What are the explanations provided by ID? My book documents scores of these “human errors,” but I would love to know what intelligent design supporters say about these five in particular.
His book is Human Errors: A Panorama of Our Glitches, from Pointless Bones to Broken Genes:
5. Why are humans so inefficient with reproduction?
The one thing that a species absolutely must be able to do is reproduce, so this is an area that humans must have mastered, right? Not even close. In fact, humans may be the least fertile of the apes. More than 10 percent of couples have trouble conceiving and when you consider what all can go wrong, it’s understandable.
To begin with, the ovaries are not even physically attached to the fallopian tubes and so eggs are sometimes squirted pointless into the abdominal cavity. Although it’s very rare, a roving sperm can actually fertilize one of these misplaced eggs and start a life-threatening abdominal pregnancy. On the male side, sperm have no sense of direction and swim in right-handed corkscrews, unable to turn left. This is part of the reason why hundreds of millions of them are needed for one to reach the egg. Many men have low sperm count or motility and many women have unpredictable ovulation cycles, meaning that the simple act of helping the meandering sperm and rudderless egg find each other is often not so simple. … More.
One wonders, in that case, how the Population Bomb movement ever got started or why … But that’s clearly not a question that a Skeptical reader would ask.
Book site: At Amazon:
- #5 in Books > Textbooks > Medicine & Health Sciences > Medicine > Basic Sciences > Physiology
- #8 in Books > Textbooks > Science & Mathematics > Biology & Life Sciences > Anatomy & Physiology
- #9 in Books > Medical Books > Basic Sciences > Physiology
See also: Vestigial organs?