Poor design

The poor design argument opposes intelligent design by noting that the design of living beings is poor, and thus no higher intelligence could account for such a design. According to proponents of the view, poor design is evinced by the fragility of humans; humans must live in an environment with a very narrow temperature range (considering the extreme highs and lows in the natural world) and easily succumb to disease and degenerative processes. Some examples:

• Sometimes a person's body produces too much estrogen or testosterone. That causes medical or psychological problems.
• If knee-caps are such a good idea, why don't we have elbow-caps ?
• The blind spot in the retina
• Some creatures (such as starfish) can grow an entire limb back if it is cut off. Humans cannot.
• Humans eventually grow old and die. This is often seen as the most serious limitation of the human body. Bacteria, yeast, and a few other creatures never grow old, and seem to have unlimited lifespans.

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