Darwin s made his observations about the variety of birds and reptiles on the _______ islands. The ________ is based on the competition for survival or struggle for existence. Organs which are structurally alike but functionally different are known as _________ organs. Evolutionany process producing homologous structures is called _________ evolution.
Organs performing similar functions but having different anatomical origin are known as __________ organs. The close resemblance between legs of insects and mammals and wings of butterflies and birds show __________ evaluation. Webbed feet of aquatic birds is example of ________ organs. As per Lamarck s theory, fused tail bones are the result of: According to which scientist, the continued stretching of the neck gave rise to modern giraffes: New varieties of animals and plants may develop by means of:
Which is of the following is not a part of Darwinism: Variations are due to hereditary and __________ characteristics. Evolutionary process producing homologus organs is called convergent evolution. Weismann postulated that body acquired characteristics resulting in phenotypic changes did not affect the germ cells. Gradual and continuous process of modification of ancestral forms is known as: Darwinism may be defined as the theory of organic evolution by the natural selection.