Bacteria lacking a nucleus
Anaerobic bacteria can live without oxygen. In fact, oxygen is toxic to many of them.
Archaebacteria called extremeophiles have some species that live entirely anaerobically. Bacteria [and other organisms] that respire using O2 as the 'final' electron acceptor are termed to be Aerobic, while bacteria [and the odd organism] that has the biochemical capacity to Live without O2 are termed to be Anaerobic.
Bacteria that must have oxygen to survive are called obligate aerobes. Some bacteria can live with or without oxygen and are called facultative anaerobes.Anaerobes = No oxygenAerobes = Oxygen
Facultative anaerobic bacteria.
Plants and anaerobic bacteria.
Obligate aerobes.
Obligate aerobes
Not all are bad, it depends on the bacteria. 'Anaerobic' just means that they live without oxygen.
Aerobic bacteria must have oxygen to live.
Many types of bacteria can live in Anaerobic conditions, I.e they don't need oxygen to live, as they create energy using anaerobic respiration.
Some bacteria and protists called anaerobes can live without oxygen. Three kingdoms have organisms that have anaerobes- kingdom bacteria, kingdom archaea, and kingdom protista
Methane is correct