Pythons have small leg bones buried in their tail muscles what can scientists conclude from this observation? I think it's python descended from animals with legs

Yes, your conclusion is correct. The presence of small leg bones buried in their tail muscles suggests that pythons evolved from ancestors that had legs. This is also supported by the fact that many other snake species also have vestigial leg bones in their bodies, indicating that they too descended from legged ancestors. These vestigial structures are remnants of the evolutionary past of these species and provide important evidence for understanding the evolutionary history of different animal groups.