Well Josep, Lamarck was a fine fellow whose ideas contributed greatly to the debate on evolution, but his notions were comprehensively superseded by Wallace's and Darwin's. His proposition about how traits are passed on has been comprehensively debunked, and it's worth remembering that he believed in spontaneous generation and alchemy. I've said it before and I'll say it again: your understanding of evolutionary theory is very shaky, and you really need to go off and read a good book about it. On The Origin of Species would be a good start. Incidentally, Darwin didn't "teach" anything.