QUESTION TEXT: Scientists analyzing air bubbles that had been…
QUESTION TYPE: Weaken
CONCLUSION: Ferrous material caused an increase in the population of antarctic algae.
REASONING: During the last ice age, there was a lot of ferrous material, but not much carbon dioxide. Algae absorb carbon dioxide.
ANALYSIS: The scientist speculated that ferrous material led to more algae.
But answer choice D shows no evidence that the number of diatoms (shells left by algae) increased.
___________
- So? This is just a fact about diatoms. This doesn’t change whether diatoms can suck carbon dioxide from the atmosphere.
- This supports the argument. It helps establish that ferrous material really could cause algal growth.
- Of course…dust has lots of things in it. As long as dust does have ferrous material, the argument can work.
- CORRECT.This evidence directly contradicts the hypothesis. If there were more algae, we would expect to see diatoms.
- This supports the argument. The argument claimed that ferrous material helped algae grow.
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