GMAT Sentence Correction
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Source: PREP
Level: 4
After determining the levels of calcium carbonate and the types of fossilized algae present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able to reconstruct the history of precipitation in tropical South America over the past 25,000 years.
- A the types of fossilized algae present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able
- B the types of fossilized algae that are present in core samples taken from the bottom of Lake Titicaca in the Andes, it was possible for a group of scientists
- C the types of fossilized algae that had been present in core samples taken from the bottom of Lake Titicaca in the Andes, that made it possible for a group of scientists
- D what types of fossilized algae had been present in core samples taken from the bottom of Lake Titicaca in the Andes, it was possible for a group of scientists
- E what the types of fossilized algae were that were present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able