Some people believe that humans have always existed as the species we see today. darwin created the theory of evolution. which observation bolsters the theory of evolution?

The observation that boosts it is how people and animals have adapted to their physical location on the globe. With people it's things like skin color. Skin color is solely based on the amount of sun and exposure to sun. The closer to equator the darker the skin will be, and vice versa. For animals, you have things like bright colors to repel predators or similar things.