Mississippi Science ZOO.9.2
The Standard
- ZOO.9
- Students will understand the structure and function of phylum Chordata, class Aves, and how they demonstrate the characteristics of living things.
Describe the fossil evidence that indicates that birds evolved from two-legged dinosaurs called theropods.
2026 Mississippi College- and Career-Readiness Standards for Science · Phylum Chordata, Class Aves
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare theropod and early bird fossils. They use feather impressions and shared bones to explain why birds descended from theropod dinosaurs.
What Mastery Looks Like
- Given fossil diagrams, a student identifies wishbones and three-toed feet in a theropod and an early bird. They use these shared traits, along with fossil feathers, to support the link.
Common Misconceptions
- Students may think feathers prove a dinosaur could fly. Some assume every theropod was a bird, or that Archaeopteryx is a confirmed direct ancestor of modern birds.
How to Assess It
- Exit ticket: A theropod fossil has feathers and a wishbone. An early bird fossil has teeth and a long bony tail. What do these fossils suggest about bird ancestry, and why?
Lesson moves
Ways to Teach It
Give pairs printed Archaeopteryx and feathered theropod fossil diagrams; have them trace wishbones, toes, and feather impressions in different colors.
Ask, 'Does a feathered dinosaur fossil prove it could fly?' Have students defend an answer using fossil evidence.
Play fossil trait match: students pair cards showing wishbones, three-toed feet, and feathers with labeled theropod and early bird diagrams.
Show a museum's Archaeopteryx fossil page; students write a two-sentence exhibit label naming a bird trait and a dinosaur trait.
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Related Standards
- ZOO.9.1
Trace the evolutionary history of modern birds beginning with the theropods. Relate how today’s birds have adapted to changing environments.
- ZOO.9.7
Explain the importance of the evolution of flight and feathers, including the morphological and physiological adaptations needed to sustain flight.
- L.3.4.5
Construct scientific arguments using evidence from fossils of plants and animals that lived long ago to infer the characteristics of early environments (e.g., m...
- BIO.4.2
Evaluate empirical evidence of common ancestry and biological evolution, including comparative anatomy (e.g., homologous structures and embryological similariti...
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