What are the four rules of natural selection?

Answer 1

Natural selection has no 'steps'. It is a continous process of filtering. However, there are a couple of key factors in natural selection, prerequisites that have to be met for natural selection to occur:

Overproduction-many organisms are produced

Genetic Variation-some organisms have different genetic traits than others

Struggle to Survive or Survival of the Fittest-The organisms with the traits better suited for their environment live while others die off

Successful Reproduction-The living organisms produce giving their offspring better traits to survive.

This process goes on changing a whole species. It is a big part of evolution. This helps organisms become the best suited to their environment that they can.

Answer 2

The four rules necessary for natural selection to occur are:
1) The Potential for Reproduction - Species must be able to mate.
2) Limited Resources - Species have to be in competition for food, water, or shelter.
3) Individual Variation - There must be slight variation between individuals (eye color, fur thickness, size, etc.)
4) Differential Survival - Slight variation must cause more efficient reproduction (The individuals who can outperform in competition for survival have more time to mate, and mate in higher numbers)