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Difficulty: MediumEvaluating Inter-Passage Relationships and Function

Passage A
Deep-sea organisms inhabit an environment devoid of solar light, leading to unique evolutionary adaptations. Among these, bioluminescence—the biological production and emission of light—serves predominantly as a defensive mechanism. Species such as the deep-sea shrimp (Acanthephyra purpurea) spew bioluminescent clouds to disorient predators, while others utilize counterillumination to match ambient downwelling light, obscuring their silhouettes from benthic hunters below. These adaptations demonstrate that light production in the bathypelagic zone evolved primarily to mitigate predation pressure where concealment is otherwise impossible.

Passage B
While early abyssal research framed marine bioluminescence strictly through the lens of predator evasion, recent visual ecology studies reveal a far more dynamic communicative function. Photophores in organisms like the lanternfish (Myctophidae) display species-specific and sexually dimorphic spatial patterns. These bioluminescent signatures facilitate conspecific recognition and mate selection in an expansive, structureless habitat. Rather than merely deterring threats, bioluminescent signaling functions as a vital social apparatus, enabling species cohesion and reproductive success in the open ocean.

Which of the following best describes the relationship between the primary functions attributed to bioluminescence in Passage A and Passage B?

  1. Passage A characterizes bioluminescence primarily as a survival tactic for predator deterrence, whereas Passage B presents it as a mechanism for intraspecific communication and reproduction.Answer
  2. B
    Passage A argues that bioluminescence is a recent evolutionary adaptation, whereas Passage B claims it is an ancient survival trait present in all marine life.
  3. C
    Passage A focuses on the chemical mechanisms of light emission, whereas Passage B evaluates the ecological impact of deep-sea fishing on photophore evolution.
  4. D
    Passage A describes bioluminescence as a universal behavior among benthic species, whereas Passage B demonstrates that bioluminescence is restricted exclusively to lanternfish.

Answer

Passage A characterizes bioluminescence primarily as a survival tactic for predator deterrence, whereas Passage B presents it as a mechanism for intraspecific communication and reproduction.
The correct response accurately contrasts the core arguments: Passage A focuses on bioluminescence as a defensive mechanism against predators (such as cloud spewing and counterillumination), while Passage B presents bioluminescence as a tool for communication, species recognition, and mate attraction.

Step-by-Step Solution

1
Analyze the main focus of Passage A
Passage A explicitly links bioluminescence to defensive survival strategies, specifically predator disorientation and silhouette camouflage (counterillumination).
Establishing the core argument of the first passage provides the baseline for comparative evaluation.
2
Analyze the main focus of Passage B
Passage B frames bioluminescence around social signaling, species-specific photophore patterns, and mate selection.
Identifying the central claim of the second passage reveals how it expands or shifts perspective relative to the first.
3
Synthesize the functional relationship between both passages
Passage A views light emission through a defensive lens, while Passage B views it through a communicative and reproductive lens.
Comparing the primary function identified in each passage directly answers the question about their inter-passage relationship.

Key Concept

Evaluating Inter-Passage Relationships and Function
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Topics

Evaluating Inter-Passage Relationships and Function

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