Can a person influence the number of the simplest?

Yes, for example, growing strains of bacteria that have been transplanted with the gene for the production of insulin. On an industrial scale, this is very beneficial and such bacteria will multiply, thereby increasing their number.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.