1. Fossil Record:

* Example: The gradual progression of horse evolution, documented by fossils showing changes in leg length, tooth structure, and overall size, demonstrating adaptation to changing environments.

* How it supports evolution: Fossils provide a direct record of past life forms, showing how species have changed over time and how new species have emerged. The sequence of fossils in rock layers reveals a progression from simpler to more complex organisms, supporting the idea of common descent.

2. Comparative Anatomy:

* Example: The similar bone structures of the forelimbs of humans, bats, whales, and horses, despite their different functions (walking, flying, swimming, running), suggesting a common ancestor.

* How it supports evolution: Similarities in anatomical structures between different organisms, even if they have different functions, suggest a shared evolutionary history. This is known as homology and points to a common ancestor from which these organisms diverged.

3. Molecular Biology:

* Example: The genetic code (the relationship between DNA sequences and amino acids) is remarkably similar across all living organisms, from bacteria to humans. This indicates a shared evolutionary origin.

* How it supports evolution: The similarities in DNA sequences, protein structure, and genetic code among different species provide compelling evidence for common ancestry. This is especially strong for closely related species, which share more genetic similarities. The analysis of these genetic relationships can also help reconstruct evolutionary trees and estimate divergence times.