Examkin

Question

Difficulty: HardEvaluating Intermediate Conclusions

An evolutionary biologist has outlined a comprehensive argument detailing the ecological success of the extinct flying reptile *Pteranodon*. Arrange the following argumentative claims into their proper logical sequence, beginning with the primary empirical evidence and progressing logically through each dependent intermediate deduction until reaching the ultimate main conclusion.

  1. 1Micro-structural analyses of fossilized *Pteranodon* cranial crests have recently revealed an internal matrix composed of highly vascularized, spongy bone tissue.
  2. 2The presence of this extensive internal network of vascular channels strongly suggests that a massive volume of blood continuously circulated just beneath the crest's thin outer dermal layer.
  3. 3Because of this substantial blood flow across a large, exposed surface area, the structure must have functioned as a highly effective radiator for dissipating excess body heat.
  4. 4This newly discovered thermoregulatory capacity would have uniquely enabled the animal to sustain the intense muscular exertion required for continuous, active flight over open oceans without overheating.
  5. 5Ultimately, it was the evolution of this vascularized cranial feature, rather than modifications to wing morphology alone, that constituted the critical adaptation allowing *Pteranodon* to monopolize offshore marine ecosystems.

Answer

The correct logical sequence begins with the empirical evidence of fossilized bone tissue, followed by a chain of three successive intermediate conclusions (blood circulation, heat dissipation, and sustained flight capabilities), and culminates in the main conclusion regarding the species' broad ecological dominance.
The argument follows a strict chain of causality and inference. It moves from physical evidence (bone structure) to physiology (blood flow), to function (radiator), to behavioral advantage (sustained flight), and finally to ecological consequence (marine dominance). Each step relies on the specific concept introduced in the step before it.

Step-by-Step Solution

1
Identify the foundational premise.
The statement describing the micro-structural analysis of the fossilized crests provides the undisputed empirical fact upon which the argument rests.
A logical argument must begin with evidence or foundational context that does not depend on the other statements.
2
Identify the primary intermediate conclusion.
The statement inferring that massive volumes of blood circulated beneath the skin follows directly from the evidence of vascularized bone tissue.
This is the most immediate logical leap from the physical evidence to physiological function, indicated by the phrase 'presence of this extensive internal network... strongly suggests'.
3
Chain the subsequent intermediate conclusions using referential indicators.
The deduction about heat dissipation ('Because of this substantial blood flow...') logically follows the blood circulation claim. In turn, the claim about sustaining flight ('This newly discovered thermoregulatory capacity...') follows from the ability to dissipate heat.
Each statement uses a structural indicator pronoun that requires the concept to be established in the immediately preceding claim.
4
Identify the main conclusion.
The statement concluding that the crest was the critical adaptation for ecosystem monopoly is the final endpoint of the argument.
This statement uses the indicator 'Ultimately' and represents the broadest claim, drawing upon the entire chain of physiological and behavioral deductions to make an ecological assertion.

Key Concept

Evaluating Intermediate Conclusions
Estimated Time:2m 0s
Rate this question

Topics

Evaluating Intermediate Conclusions

More questions from this topic