A Few Examples
1. Related traits between species must occur at the same time:
For survival, some species require others to help with self-cleaning, such as when small fish clean off their predators. Unless complex changes in the genetics of both predator and prey occur, a fish genetically intent on cleaning its predator will only be helpful in providing lunch, and will not be around to reproduce this symbiotic tendency.
2. Related traits within a species must occur at the same time to avoid extinction.
The Bombardier Beetle has chemical spraying mechanisms which eject irritating solutions in a specific direction. The presence of spraying mechanisms must occur alongside the ability to produce the irritating spray itself.
For survival, some species require others to help with self-cleaning, such as when small fish clean off their predators. Unless complex changes in the genetics of both predator and prey occur, a fish genetically intent on cleaning its predator will only be helpful in providing lunch, and will not be around to reproduce this symbiotic tendency.
2. Related traits within a species must occur at the same time to avoid extinction.
The Bombardier Beetle has chemical spraying mechanisms which eject irritating solutions in a specific direction. The presence of spraying mechanisms must occur alongside the ability to produce the irritating spray itself.