Respuesta :
Answer:
D. differences in the characteristics of individual trees
Explanation:
Natural selection and evolution can only occur if there are differences in the characteristics of individual organisms. Organisms with advantageous adaptations, such as deep roots, are more likely to survive and reproduce than organisms without the advantageous adaptations. Continuous natural selection of one trait over another causes organisms to evolve so the advantageous trait eventually becomes more common in a population.