Answer :
Final answer:
Transitional fossils like Tiktaalik and Archaeopteryx demonstrate evolutionary transitions between different groups of organisms.
Explanation:
Transitional fossils provide evidence of organisms having traits from both ancestral and descendant groups, illustrating evolutionary changes over time. One such example is Tiktaalik roseae, a fossil showing features intermediate between finned fish and legged tetrapods. Another well-known transitional fossil is Archaeopteryx, believed to be closely related to birds and Theropod dinosaurs.
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