If natural selection operates to select for a specific trait, which statement must be true about that trait for evolution to occur?

The trait is resistant to mutations.
All forms of the trait have the same impact on survival.
The trait is passed on genetically to the next generation.
The trait is the same for all organisms.

Question

If natural selection operates to select for a specific trait, which statement must be true about that trait for evolution to occur?

The trait is resistant to mutations.
       All forms of the trait have the same impact on survival.
       The trait is passed on genetically to the next generation.
       The trait is the same for all organisms.

destinymasha · Answer

First the mutation -which creates  the special trait, then when they reproduce, it passes on, and becomes normal :3--so, it must be passed on genetically to the next generation...then when the mutation occurs again--the process starts all over