Darwin vs. Lamark

Darwin vs. Lamark

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  • Welcome to the scientific debate before the Royal Society of London for Improving Natural Knowledge tonight's guest will be debating their evolution theorys.
  • First off; Darwin My theory states that all organisms are all different and have many different variations. If these variations are helpful in insuring that the organisms survive, then that organism will reproduce and create offspring. If these variations do not benefit the organism, then they will die off and not be able to reproduce. This concept is called natural selection.
  • My experiences on the Galapagos island help back up my statement. When I came back to England, I brought finches with me. At first I wasn't very sure on how they were related, but back in England they were examined and we found out that I had brought back 13 species of finches. The main differences between the birds were their different beaks. Some we found were small, and some we found were large. Each species of bird were adapted to the availability of resources.
  • Lamark; I oppose your theory. My theory states that changes made in an organisms life would be passed on to their offspring. The change would be made to fulfill a want or need. I believe that all elephants used to have short trunks, and when they could not reach certain resources, they stretched their trunks and after time they became longer. I believe that the long trunks were passed down through the elephants offspring, and that is why we have long trunk-ed elephants.
  • Darwin; That is highly false. Acquired characteristics cannot be inherited by offspring. For example, if a dogs ears are cropped, his offspring will still be born with long ears. Another part of my theory states that all organisms come from a common ancestor. An example is vertebrate limbs, each limb seems to have an upper limb bone, and two lower limb bones. As new species evolved from that common ancestor, the structure of the limb was changed by natural selection- in different ways.
  • And now to educate you on the reasoning behind elephants long trunks; you are correct in saying most of the elephants had short trunks, but little do you know there were some that had long trunks. When there were no resources the elephants with the short trunks could reach, they died off. How ever, the elephants with the longer trunks survived and reproduced, and over time there were just elephants with long trunks.
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