What are some activities you can do without having sexual contact with someone?

In the practice of science, this type of reasoning is used to develop explanations.

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.

What is the one part of the nucleotide  that differs among the other different nucle  tides?