Which of the following mutations is evolutionarily important?

after an injury, a replacement skin cell mutates during replication.
a gene in an egg cell inserts two extra base pairs during cell division.
exposure to radioactive material causes cancer in a nuclear power plant worker.

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.