Who disproved Lamarck's Theory of acquired characters? How ?

Explanation

Lamarck.s theory of acquired characters was disapproved by August Weisman .
He conducted experiments on mice for 20 generations by cutting their tails and breeding them. The progenies were with tail. He proved that changes in somatoplasm will not be transferred to the next generation, but changes in germ plasm will be transferred to next generation.