The Petrified Forest of Arizona includes a great diversity of fossils. In the picture above, paleontologist Randall Irmis excavates a plate from a specimen of Buettneria.

Based on the discussions of evolution in class and in the textbook, it is likely that:

Question

The Petrified Forest of Arizona includes a great diversity of fossils. In the picture above, paleontologist Randall Irmis excavates a plate from a specimen of Buettneria.  
 
Based on the discussions of evolution in class and in the textbook, it is likely that:

BlackTom AI · Accepted Answer

Because evolution produces descent with modification, fossils like Buettneria are expected to show similarities to living organisms but also recognizable differences.

1) Relevant knowledge points and concepts
- Descent with modification: species change over time; extinct taxa are typically ancestral or closely related to some extant lineages.
- Homology and transitional features: fossils preserve anatomical traits that reveal common ancestry.
- Extinction and speciation: many fossil species do not persist unchanged to the present; they either give rise to new lineages or go extinct.

2) Step‑by‑step reasoning
- Step 1: Buettneria is a fossil taxon found in ancient rocks. Fossils represent organisms that lived in the past.
- Step 2: If life evolves, past organisms should share traits with present organisms only to the extent of common ancestry and subsequent change.
- Step 3: Therefore Buettneria should show both shared, homologous features with related modern groups and unique features that reflect its age and evolutionary position.
- Step 4: Because many fossil species are not identical to modern species (they occupy different branches/times), the most likely relationship is “related but recognizably different.”

3) Intermediate steps / evidence (qualitative)
- Compare morphological characters: shared structures indicate relationship; differences indicate evolutionary change.
- Time elapsed: geological time allows accumulation of many changes, so morphological identity is unlikely.

4) Why the correct answer is correct
- “Related, but recognizably different” matches the principle that fossils document evolutionary change. Buettneria would be expected to share ancestry with some modern amphibian lineages (or other groups) while retaining distinctive characters that place it as a separate, extinct species.

5) Why the other options are incorrect
- “Essentially identical to species still alive today” is unlikely because long-term evolutionary change and extinction usually prevent perfect identity across deep time.
- “Completely unrelated to species still alive today” is unlikely because life is connected by common descent; most fossil taxa share some relationship to extant groups.

6) Conclusion
- The best choice is: Buettneria is related to, but recognizably different from species still alive today, which matches the provided answer.

The Petrified Forest of Arizona includes a great diversity of fossils. In the picture above, paleontologist Randall Irmis excavates a plate from a specimen of Buettneria. Based on the discussions of evolution in class and in the textbook, it is likely that:单项选择题

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