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Natural Selection!
Individuals suited to the struggle for existence will survive and reproduce better than individuals not so suited. Differential reproductive success is just another name for evolution by natural selection.
Natural selection.
A simplified explanation. Natural selection is the nonrandom survival and reproductive success of randomly varying organisms who by this reproductive success change the allele frequency over time in populations of organisms, which is evolution.
Natural selection and sexual selection are both mechanisms of evolution, but they differ in how they shape species. Natural selection acts on traits that affect an organism's survival and ability to reproduce in its environment, leading to adaptations that increase survival and reproduction. Sexual selection, on the other hand, acts on traits that affect an organism's ability to attract mates and reproduce, leading to the development of traits that enhance mating success. In summary, natural selection primarily influences survival and reproductive success in the environment, while sexual selection primarily influences mating success and reproductive opportunities.
It wasn't! The theory of evolution by natural selection has nothing to do with social Darwinism and to posit such a connection is ill posed. The theory of evolution by natural selection is about individual selection of organisms and has nothing to do with group to group success in economic terms.
VALIDITY
Reproductive success. You are not evolving, but your progeny will; if you have any.
Natural selection is most closely related to Darwin's theory of evolution.
Selection acts directly on individuals within a population, favoring certain traits that increase an individual's survival and reproductive success. This process leads to the differential reproductive success of individuals with advantageous traits, ultimately shaping the genetic makeup of the population.
Short and memorably answer. Natural selection is the nonrandom survival and reproductive success of randomly varying organisms. Natural selection is the main driver of adaptive change leading to evolution.
The theme of the selection was the importance of perseverance in the face of adversity. It highlighted how determination and resilience can lead to success despite facing challenges or setbacks.