Darwin's Theory of Evolution

Darwin's theory was that all life like creature evolved from other species. Also from a descendent from a common ancestor in their family tree. Darwin though that the birds and the bannannas , the fish and the flowers were all related of some sort. Well Darwin's general theory presumes the growth of life from a non living world and stresses a purely naturalistic undirected descent with modification. also complexe creatures start to evolve from simple looking ancestors over time. Darwin's theory was a theory in crisis in temendous advances.