Two different species of bacteria are examined. Scientists find that species X always produces CO2 and H2O during cellular respiration. Species Y always produces ethyl alcohol and CO2. Which conclusion can be made from these observations?(1 point)

Based on the observations provided, the correct conclusion is:

Only species Y is anaerobic.

Here's the reasoning:

• Species X producing CO2 and H2O during cellular respiration indicates it is undergoing aerobic respiration, where oxygen is used, and the byproducts are carbon dioxide and water.
• Species Y, producing ethyl alcohol and CO2, suggests it is undergoing alcoholic fermentation, which is a type of anaerobic process (it does not use oxygen).

Therefore, species Y is the one that is anaerobic, while species X is aerobic.