What does the Theory of Evolution propose about organisms?

The Theory of Evolution proposes that all organisms have descended from one or a few common ancestors and have gradually evolved and diversified over time. This concept is rooted in natural selection, where beneficial traits become more common in a population as they enhance survival and reproduction. The idea emphasizes the processes of adaptation and speciation, illustrating how organisms can adapt to their environments, leading to the variety of life forms we see today. As species evolve, they accumulate changes that can result in significant differences from their ancestors, highlighting the dynamic nature of life on Earth. This understanding is supported by a wealth of scientific evidence from genetics, paleontology, and comparative anatomy.