Convergent evolution refers to the formation of similar traits by unrelated groups of organism e. g., Tasmanian wolf and wolf. The adaptive radiation (divergent evolution) is exhibited by the limb structure in mammals. The limbs in mammals are variously adapted for climbing, flying, running, swimming or burrowing etc. According to Lamarck all that has been acquired by the organisms during its life time due to direct or indirect environmental effects is preserved by the generation and is transmitted to the off springs.