Adaptation takes time. Maybe the environment is changing faster than the organs evolve. Also, evolution finds local optima, not global ones, so it can get stuck at suboptimal designs which any incremental changes would only make worse.
Adaptation takes time. Maybe the environment is changing faster than the organs evolve. Also, evolution finds local optima, not global ones, so it can get stuck at suboptimal designs which any incremental changes would only make worse.