Consider the initial development of 'Darwin’s theory of evolution'. What were the processes involved?
I believe you are asking what was the process, according to Darwin, of how evolution progressed. You may get additonal answers.
1. Life comes from non-life. Life arrived as an accident and its onset began as a common link among all living things (perhaps what we know today as carbon, as it is the basic element of all organisms).
2. All species, being related, are exposed to their environment and must meet a criteria to survive changes.
3. As climate, temperature, and other circumstances change, it takes with it the weakest links of each species- those who could not be able to change with change.
In the words of Erns Myar, what follows is:
1) Species have great fertility. They make more offspring than can grow to adulthood.
2) Populations remain roughly the same size, with modest fluctuations.
3) Food resources are limited, but are relatively constant most of the time.
From these three observations it may be inferred that in such an environment there will be a struggle for survival among individuals.
4) In sexually reproducing species, generally no two individuals are identical. Variation is rampant.
5) Much of this variation is heritable.
From this it may be inferred: In a world of stable populations where each individual must struggle to survive, those with the "best" characteristics will be more likely to survive, and those desirable traits will be passed to their offspring. These advantageous characteristics are inherited by following generations, becoming dominant among the population through time. This is natural selection