Today, researchers using the genetic techniques of "evo devo" can trace the evolution of the various kinds of organisms that Darwin fit into his "tree of ... parts of both animals and plants ...

Although the ladder of life idea was central to the evolutionary theories advanced by many of his predecessors, Charles Darwin largely rejected the ladder concept in favor of a tree; indeed ...

burst forth in high admiration of Lamarck and his views on evolution ... In tidal pools along the Firth of Forth, Darwin and Grant collect sea mats, animals that resemble plants.

Ammonite fossils, an example is shown here, are sea creatures that became extinct ... This supports Darwin's theory of evolution, which states that simple life forms gradually evolved into more ...