10 free GMAT practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
GMAT Practice Test 9Tutor mode
Question 1 of 10
Verbal Reasoning
Ecologist: The native mussel population of the Lindell River declined sharply after an invasive snail became established there. Because the snail eats the same algae that the mussels' larvae depend on, removing the snail from the river will allow the mussel population to recover.
Which of the following is an assumption on which the ecologist's argument depends?