Species origin refers to the process by which new species arise through evolution. This can occur through mechanisms such as natural selection, genetic drift, and speciation, where populations of organisms diverge over time due to environmental changes or reproductive isolation. Understanding species origin helps scientists trace the evolutionary history of organisms and their relationships. By studying fossils, DNA, and morphological traits, researchers can reconstruct how species have adapted and evolved, providing insights into biodiversity and the interconnectedness of life on Earth.