Jean-Baptise Lamarck
Lamarch said that animals change during their children. For example, giraffes strech their necks to reach leaves, so their children have necks.
Connection to Darwin's theory: Darwin agreeded that life changes over time but he did not agree with Lamarck's idea about passing changes to children. (Standford Encylopedia of Philosophy,2023) (1 Aug 1744 Jahr – 18 Dez 1829 Jahr)