The statement that "humans are not evolving" is not accurate. Humans, like all other living organisms, continue to undergo evolutionary processes. Evolution is a gradual change in the inherited characteristics of a population over successive generations.
While it is true that the overall pace of human evolution may be relatively slower compared to other species or compared to certain periods in the past, evolution is an ongoing process that operates on different timescales. Several factors contribute to the continuous evolution of the human species:
Genetic Variation: Humans exhibit genetic variation within populations, which provides the raw material for evolutionary change. Mutations, genetic recombination, and gene flow contribute to genetic diversity.
Natural Selection: Environmental pressures and selective forces still act on human populations. Certain genetic traits may provide advantages or disadvantages in specific environments, leading to differential reproductive success and the spread of favorable traits over time.
Sexual Selection: Human mate selection preferences can influence the evolution of certain physical or behavioral traits. These preferences can lead to the development of specific features or behaviors that are considered desirable.
Cultural Evolution: Humans also undergo cultural evolution, which can influence the direction and pace of biological evolution. Cultural practices, technologies, and social behaviors can shape the selective pressures acting on human populations.
It is important to note that the effects of human evolution may not always be readily apparent in our day-to-day lives because evolutionary changes occur over long timescales and are often subtle. Additionally, advancements in medicine, technology, and cultural practices have altered the selective pressures that humans experience, potentially influencing the trajectory of human evolution.
In summary, humans are indeed subject to ongoing evolutionary processes, although the specific patterns and rates of human evolution can be influenced by various factors, including cultural and technological advancements.