Given a scientific passage and an answer, generate a question for the given answer.

Passage: Test wells are drilled to monitor groundwater pollution. Answer: test wells
What are drilled to monitor groundwater pollution?

Passage: Bacteria change nitrogen gas from the atmosphere to nitrogen compounds that plants can absorb. Answer: bacteria
What changes nitrogen gas from the atmosphere to nitrogen compounds that plants can absorb?

Passage: What goes into the cell? Oxygen and glucose are both reactants of cellular respiration. Oxygen enters the body when an organism breathes. Glucose enters the body when an organism eats. Answer: oxygen
What element enters the body when an organism breathes?