The following points highlight the top four abiotic factors that influencing habitats. The factors are: 1. Temperature 2. Pressure 3. Radiation 4. Light. Factor # 1. Temperature: Life can exist within a narrow range of temperature. Even within this narrow range, temperature tolerance of various species of animals varies. The temperature tolerance of a given species at different stages of [...]
The following points highlight the four theories for organic evolution of living organisms. The theories are: 1. Lamarckian Theory 2. Darwinism and the Theory of Natural Selection 3. Synthetic Theory of Evolution 4. De Vries—The Theory of Mutation. Theory # 1. Lamarckian Theory: Jean Baptiste de Lamarck (1744-1829), a French Scientist, was undoubtedly the first biologist to propose a definite [...]
The following points highlight the nine evidences for organic evolution of living organisms. The evidences are: 1. Bio-Geographical 2. Morphological 3. Embryological 4. Geological 5. Taxonomical 6. Comparative Physiology and Biochemistry 7. Cytogenetical 8. Domestication 9. Specific Adaptations. Evidence # 1. Bio-Geographical: The study of biogeography or the geographical distribution of animals and plants on the surface of the earth [...]