Lamarck VS Darwin powerpoint presentation.pptx

Science !0

1. OCCURENCE OF EVOLUTION

2. THEORY -is an idea about how something in nature works that has gone through rigorous testing through observations and experiments designed to prove the idea right or wrong.

3. THEORY OF NEED States that organisms change in response to their environment. Their ability to survive helped them develop characteristics necessary for them to adapt in a given environment.

4. THEORY OF USE AND DISUSE According to Lamarck, organs not in use will disappear while organs in use will develop.

5. THEORY OF ACQUIRED CHARACTERISTICS Acquired characteristics were believed to be inherited by their offspring and propagated by the next generation of giraffes.

6. According to Darwin, giraffe species originally had varying neck lengths but natural selection favored the survival of giraffes with longer necks that could feed on taller trees that were available.

7. Giraffes with short necks were eliminated due to lack of accessible food supply

8. ALFRED RUSSEL WALLACE (1823-1913)

9. Natural selection is the process through which species adapt to their environments. It is the engine that drives evolution.