In what way does modern evolutionary theory differ from the theory as proposed by darwin

Darwin's theory relied on natural selection as the only known mechanism. ... The modern synthesis of the Theory of Evolution hypothesizes that speciation is most likely due to the gradual accumulation of small changes or mutations at the gene level. In other words, microevolution leads to macroevolution.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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