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Difficulty: MediumRhetorical Synthesis: Summarization and Generalization

While researching *Castorocauda lutrasimilis*, a student takes the following notes:
* *Castorocauda lutrasimilis* is an extinct mammaliaform species that lived during the Middle Jurassic period.
* In 2006, paleontologist Qiang Ji and his team discovered a well-preserved fossil of the species in Inner Mongolia, China.
* The fossil revealed webbed feet and a broad, scaly tail, indicating adaptation to a semi-aquatic lifestyle.
* Previously, scientists believed that Jurassic mammaliaforms were strictly land-dwelling.
* The discovery of *C. lutrasimilis* demonstrated that early mammal relatives adapted to diverse aquatic environments much earlier than once thought.

The student wants to summarize the discovery and its significance. Which choice most effectively uses information from the given notes to accomplish this goal?

  1. The 2006 discovery of a *Castorocauda lutrasimilis* fossil showing semi-aquatic features demonstrated that early mammal relatives adapted to diverse aquatic environments much earlier than previously believed.Answer
  2. B
    Paleontologist Qiang Ji and his team discovered a well-preserved fossil of *Castorocauda lutrasimilis*, an extinct Middle Jurassic mammaliaform, in Inner Mongolia, China, in 2006.
  3. C
    The discovery of *Castorocauda lutrasimilis* proves that all Middle Jurassic mammaliaforms eventually abandoned land-dwelling lifestyles for semi-aquatic habitats.
  4. D
    Although scientists long believed early mammal relatives were semi-aquatic, the discovery of the strictly land-dwelling *Castorocauda lutrasimilis* fossil in 2006 disproved this assumption.

Answer

The 2006 discovery of a *Castorocauda lutrasimilis* fossil showing semi-aquatic features demonstrated that early mammal relatives adapted to diverse aquatic environments much earlier than previously believed.
The correct answer successfully summarizes the discovery of the *Castorocauda lutrasimilis* fossil and its significance by stating that it had semi-aquatic adaptations, which showed early mammal relatives adapted to aquatic environments earlier than previously thought.

Step-by-Step Solution

1
Analyze the student's rhetorical goal.
The goal is to summarize both the discovery of *Castorocauda lutrasimilis* and its scientific significance.
This establishes the criteria for evaluating the answer choices.
2
Identify the key details of the discovery and its significance in the notes.
The discovery is a fossil of *C. lutrasimilis* with semi-aquatic features (webbed feet and scaly tail). The significance is that it shows early mammal relatives adapted to aquatic environments much earlier than previously believed (when they were thought to be strictly land-dwelling).
This provides the factual content that must be present in the correct summary.
3
Evaluate the choices against the criteria.
The option containing the 2006 discovery of *Castorocauda lutrasimilis* and its implication for early mammal diversity correctly synthesizes the notes. The option describing only the team and location neglects the significance. The option claiming all mammaliaforms abandoned land is too broad. The option reversing the habitats misreads the notes.
This leads to selecting the correct option that successfully achieves the rhetorical goal.

Key Concept

Synthesizing details from a list of notes to form a concise summary that addresses a specific rhetorical goal.
Estimated Time:1m 0s
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Topics

Rhetorical Synthesis: Summarization and Generalization

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