Building the Argument
Build a scientific argument classifying the Tometti fossil in Grade 8 evolution science. Students construct a claim-evidence-reasoning argument using diagnostic hip socket structures to prove Tometti is more closely related to birds than to crocodiles, demonstrating how fossils reveal evolutionary lineages.
Key Concepts
In the seminar, we construct a final scientific argument.
Claim : Tometti is more closely related to birds than to crocodiles.
Common Questions
How is the Tometti fossil classified in relation to birds and crocodiles?
Tometti is classified as more closely related to birds based on the presence of diagnostic hip socket structures shared only with the bird lineage. Despite living in a similar era as crocodiles, the skeletal evidence places Tometti in the bird's ancestral branch of the evolutionary tree.
What makes a scientific argument about fossil classification valid?
A valid classification argument follows claim-evidence-reasoning structure: the claim states the classification, the evidence identifies the specific diagnostic structures present in the fossil, and the reasoning explains why those structures prove inheritance from a more recent common ancestor shared with birds than with crocodiles.
Why do hip socket structures indicate closer relationship to birds than to crocodiles?
Specific hip socket configurations evolved in the ancestor of birds and their relatives but not in crocodile ancestors. Finding this structure in Tometti indicates it inherited from an ancestor it shares with birds—a more recent shared ancestor than it shares with crocodiles.