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Natural selection 
Each individual is subjected to a process of natural selection 
Every animal or hunman is different from each other
Environmental influces have an effect on living things
Mutations
Mutations are random changes in DNA
Although it can also be described as copying errors withen the DNA
And can be triggered by toxins, smoking, and radiatation 
Heredity
Heredity means the passing on of DNA to offspring 
two factors come into play in heredity, which are recombination and mutation 
The parents each provide 50% of their      DNA
Excess production
In nature creatures create more offspring than needed
Many offsprings die as a result 
the more offspring produced the more littles difference occur 
how evolution works