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Set 5: Cross-Text Connections

Explanation

Answer: A

PASSAGE

Text 1 Keystone species are organisms that have a disproportionately large effect on their environment relative to their abundance. For example, sea otters keep sea urchin populations in check, preventing them from destroying kelp forests. Text 2 The removal of a keystone species can lead to a 'trophic cascade.' Without otters, urchins multiply, consume all the kelp, and destroy the habitat for countless other species. The ecosystem collapses from the top down.

Based on the texts, what is the consequence of removing a keystone species?

A. It triggers a chain reaction that destabilizes the entire ecosystem.✓ Correct
B. The ecosystem improves.
C. Sea urchins die out.
D. Kelp forests grow larger.

Detailed Explanation

Text 1: Keystone exerts large effect (Otters -> Urchins -> Kelp). Text 2: Removal = Trophic cascade/Collapse. Consequence: Destabilization.

Key Evidence:

• "trophic cascade"

• "ecosystem collapses"

• "destroy the habitat"

Why others are wrong: B (Collapses.), C (Multiply.), D (Destroyed.).

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