Student prepared a test tube containing yeast, glucose, and water. after 24 hours, the test tube was analyzed for the presence of several substances. what substance would the student expect to find if respiration occurred in the test tube?

In the presence of oxygen, respiration of yeast produces carbon dioxide and water. In the absence of oxygen, respiration of yeast produces carbon dioxide and alcohol.

Under the assumption that the yeast has insufficient exposure to oxygen in the surrounding air in the testtube, alcohol and carbon dioxide would be expected to be found in the test tube

b is the answer and if you need further with anything message me

the answer is definitely a