Darwin and Lamarck had different ideas about how evolution works:

Lamarck's Theory:

• He believed in something called inheritance of acquired characteristics. This means that if a giraffe stretched its neck to get leaves, its babies would be born with longer necks.
• Lamarck thought that individual effort played a big role in how species change over time.

Darwin's Theory:

• He came up with the idea of natural selection. According to Darwin, the giraffes with longer necks were better at surviving and having babies, so they passed their long necks to their young.
• Darwin said that changes happen gradually over time because of random mutations and "survival of the fittest."

These different views helped shape our understanding of evolution today!