Lamarck's evolution theory could be summarised by the statement that

Lamarck's theory of evolution can be summarized by the statement: "the changing environment imposes structural, physiological, and behavioral changes in organisms." This means that Lamarck believed that organisms could adapt to their environment by developing new traits and characteristics in response to the challenges posed by their surroundings. According to Lamarck, these changes could be passed down to future generations, resulting in the evolution of new species over time. This is in contrast to the theory of natural selection proposed by Charles Darwin, which posits that the fittest individuals are more likely to survive and reproduce, passing on their advantageous traits to their offspring.