Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.Click to see full answer. Similarly, you may ask, which condition is essential for natural selection to result in a new species quizlet?Limited resources in ecosystems results in competition for those resources. (Or against predators, etc.) Variation, overproduction, and competition lead to natural selection by the environment: individuals with better adaptations are better able to complete, survive longer and produce more offspring.Also Know, what are the 4 factors of natural selection? Natural selection occurs if four conditions are met: reproduction, heredity, variation in physical characteristics and variation in number of offspring per individual. Similarly, which would least likely be a cause of natural selection? Overpopulation would be the least likely cause of natural selection. Adaptation, evolution and variation are all causes of natural selection.What are the two key ingredients to natural selection? Darwin’s process of natural selection has four components. Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. Inheritance. Some traits are consistently passed on from parent to offspring. High rate of population growth. Differential survival and reproduction.