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[gene: a hereditary unit] So, the change in frequency of dark colored moths represented a change in the gene pool.
[gene pool: the set all of genes in a population] This change was, by definition, evolution.
Evolution is a change in the gene pool of a population over time.
A gene is a hereditary unit that can be passed on unaltered for many generations.
Evolution can occur without morphological change; and morphological change can occur without evolution.
Humans are larger now than in the recent past, a result of better diet and medicine.
Against a sooty background, birds could see the lighter colored moths better and ate more of them.
The increase in relative abundance of the dark type was due to natural selection.
The late eighteen hundreds was the time of England's industrial revolution.
Individual organisms do not evolve, they retain the same genes throughout their life.
When a population is evolving, the ratio of different genetic types is changing -- each individual organism within a population does not change.