What is the Difference Between Lamarckism and Darwinism?

Lamarckism and Darwinism are two different theories of evolution proposed by Jean-Baptiste Lamarck and Charles Darwin, respectively. Here are the key differences between the two theories:

1. Mechanism of Evolution: Lamarckism is based on the concept of an internal vital force that drives evolution, while Darwinism supports natural selection as the driving force behind evolution.
2. Inheritance of Acquired Traits: Lamarckism proposes that organisms inherit all acquired traits, while Darwinism suggests that only useful variations are passed on to succeeding generations.
3. Struggle for Existence: Darwinism emphasizes the struggle for existence and the survival of the fittest, while Lamarckism discredits the struggle for existence and does not base its theory on the concept of survival of the fittest.
4. Development or Disappearance of Organs: In Lamarckism, the development or disappearance of an organ is due to its constant use or lack thereof, while Darwinism suggests that organs develop if they provide a survival advantage.
5. Evidence and Acceptance: Darwin's theory gained more acceptance because it had more evidence supporting it, while Lamarck's theory suggests that all organisms become more complicated over time, which does not account for simple organisms.

In summary, the main differences between Lamarckism and Darwinism lie in their mechanisms of evolution, inheritance of traits, emphasis on the struggle for existence, and the development or disappearance of organs. Darwinism has gained more acceptance due to its stronger evidence base and better explanation of the diversity of life on Earth.

Comparative Table: Lamarckism vs Darwinism

Here is a table comparing the differences between Lamarckism and Darwinism:

Lamarckism, proposed by Jean Baptiste de Lamarck, is based on the theory of use and disuse, believing that acquired traits can be passed on to offspring. On the other hand, Darwinism, proposed by Charles Darwin, emphasizes natural selection and the struggle for existence as the driving forces of evolution.