Here's why:
* Diversity: Evolutionary biology explains the vast array of life forms on Earth, from microscopic bacteria to towering trees, through processes like natural selection, adaptation, and speciation.
* Unity: Despite this diversity, all living organisms share a common ancestor and fundamental characteristics like DNA, cell structure, and metabolic processes. Evolutionary biology explains this unity through the concept of common descent and the shared evolutionary history of all life.
So, evolutionary biology provides a powerful framework for understanding both the amazing variety and the underlying interconnectedness of all living things.