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Zorluk: OrtaLogical Inferences

Eelgrass plays a critical role in coastal ecosystems by stabilizing sediment and providing habitats for marine life. However, agricultural nutrient runoff often triggers microalgal blooms that block sunlight, causing eelgrass declines. Ecologist Sarah Alvarez monitored several estuaries to study this dynamic. She observed that in estuaries with high nutrient levels but low populations of filter-feeding bivalves, eelgrass density decreased significantly. Conversely, in estuaries with similarly high nutrient levels but abundant populations of filter-feeding bivalves, eelgrass beds remained healthy and dense. Which choice most logically completes the text?

  1. filter-feeding bivalves can counteract the disruptive effects of nutrient runoff on eelgrass beds.Cevap
  2. B
    filter-feeding bivalves will eventually replace eelgrass as the primary stabilizer of coastal sediments in high-nutrient estuaries.
  3. C
    coastal ecosystems cannot support marine life unless they contain both eelgrass beds and filter-feeding bivalves.
  4. D
    eelgrass beds grow more rapidly when exposed to high nutrient levels than when exposed to low nutrient levels.

Cevap

filter-feeding bivalves can counteract the disruptive effects of nutrient runoff on eelgrass beds.
The correct option is supported by the direct comparison in the text. In estuaries with high nutrients but few bivalves, eelgrass declined. However, in estuaries with high nutrients and abundant bivalves, eelgrass remained dense and healthy. This indicates that the presence of filter-feeding bivalves counteracts the negative impacts of nutrient runoff on eelgrass beds.

Adım Adım Çözüm

1
Identify the primary threat to eelgrass in the text.
Agricultural nutrient runoff leads to algal blooms that block sunlight and cause eelgrass declines.
To establish the baseline negative impact on eelgrass.
2
Analyze the conditions under which eelgrass remains healthy.
Eelgrass beds remained healthy and dense despite high nutrient runoff when filter-feeding bivalves were abundant.
To identify the factor (bivalves) that prevents the typical decline of eelgrass.
3
Deduce the relationship between bivalves and the runoff's effects.
Because bivalves prevent eelgrass decline under high nutrient levels, they must counteract the negative effects of the runoff.
To formulate a logically valid inference that directly completes the text.

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Logical Inferences
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Logical Inferences

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