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?
only species y is aerobic.
only species y is anaerobic.
both species x and y are aerobic.
both species x and y are anaerobic.

Only species Y is anaerobic.

Explanation:

Cellular respiration refers to the process in which food substances such as glucose are broken down to yield energy in the form of ATP, water and carbon dioxide as by-products.Respiration may be either anaerobic or aerobic respiration.Aerobic respiration is a type of respiration that takes place in the presence of oxygen. Nutrients are broken down to yield energy, water, and carbon dioxide.Anaerobic respiration occurs in the absence of oxygen to yield few molecules of ATP, alcohol and carbon dioxide. Therefore; species X carries out aerobic respiration while species Y carries out anaerobic respiration.

Most smaller stars don't have a radiative zone.