Final answer:
Transitional fossils like Archaeopteryx and shared anatomical characteristics provide strong evidence for the claim that birds evolved from dinosaurs.
Step-by-step explanation:
The strongest evidence to support the claim that birds evolved from dinosaurs is the fossil record, specifically the discovery of transitional fossils such as Archaeopteryx. Archaeopteryx is an early bird-like dinosaur that exhibited both reptilian and avian characteristics, such as feathers and reptilian teeth. It is considered a crucial link between dinosaurs and birds, providing strong evidence for their evolutionary connection.
Furthermore, other dinosaur fossils, particularly those of therapods like Deinonychus, share several features with birds. These include a similar flow-through respiratory system with lungs and air sacs, as well as comparable hip and wrist bones. These anatomical similarities further support the evolutionary relationship between birds and dinosaurs.
Overall, the presence of transitional fossils and shared anatomical characteristics provide the strongest evidence for the claim that birds evolved from dinosaurs.