What key contribution did Jean Baptiste Lamarck make to evolutionary biology? How was his theory of evolution different from Darwin's?
Answer: the idea that the very simplest forms of plant and animal life were the result of spontaneous generation. Life became successively diversified, he claimed, as the result of two very different sorts of causes. His theory was use and disuse and pangenesis. Darwin was natural selection and germplasm(long neck giraffes survive and reproduce).