How Living Things Change (1957)

Discusses the evolution of animals over millions of years, focusing on how species like horses and elephants developed from their prehistoric ancestors. It highlights the role of selective breeding in producing desirable traits in livestock, such as cows and chickens, and contrasts this with the natural processes of evolution. The text explains early theories of evolution, particularly those of Jean Pierre Lamarck, who proposed that acquired characteristics could be inherited, and Charles Darwin, who introduced the concept of natural selection. It also mentions mutations as a factor in evolution, providing examples of how they can lead to significant changes in species. The text concludes by emphasizing the contributions of various scientists to our understanding of evolution and the mechanisms behind changes in living organisms.

**Keywords:** evolution, animals, horses, elephants, selective breeding, natural selection, Lamarck, Darwin, mutations, species, characteristics, prehistoric, breeding stock, fossils, adaptation.

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