Please pick one question to ask at a time - both of these questions have already been asked and answered.
Natural selection occurs when four conditions are met: 1. There is variation among individuals. 2. That variation is at least partially heritable. 3. That variation is linked to differential reproductive success. 4. More individuals are born than can survive and reproduce.
when there is competition
The four stages are: Overproduction, Genetic Variation, Struggle to Survive, and Successful Reproduction
I'm not sure if it occurs in Ohio and Midwestern States.
Overproduction, genetic variation, selection, and adaption
Overproduction, variation, selection, and adaptation
See the related answer below for an answer to this question.
- natural selection - sexual selection - genetic drift - immigration/emagration
Mutation, Natural Selection, Migration, and Genetic Drift.
overproduction: to many offspring and 3 others
The question is semantically equivalent to asking 'What are the four parts of the existence of a banana?' I cannot answer it.
Abiogenesis, or more commonly known as the origin of life itself, is not part of Darwin's theory of evolution.