Question

what environment would you be most likely to find anaerobic bacteria living in?
a carbon dioxide rich environment
an oxygen rich environment
an oxygen depleted environment
an environment depleted in carbon dioxide

Explanation:

Anaerobic bacteria do not require oxygen for respiration and can be harmed by it. So, they thrive in environments with little to no oxygen. An oxygen - depleted environment (option C) is suitable for them. An oxygen - rich environment (option B) is not suitable as oxygen can be toxic to them. A carbon dioxide - rich (option A) or carbon dioxide - depleted (option D) environment is not the key factor for anaerobic bacteria; their main requirement is the absence of oxygen.

Answer:

C. An oxygen depleted environment