Methanogens usually require Choose one: A. acidic conditions. B. methane as a substrate. C. high temperatures. D. association with bacterial species.

D. association with bacterial species.

Explanation:

Methanogens -

These are the organisms , that falls under the category of the prokaryotes , in the domain archaea .

Methanogens are a type of microorganism , which is capable to produce methane as one of the by product during a hypoxic condition .

These organisms are found in the wetland , inside the digestive system of the humans and animals .

They have an important space for the treatment of the anaerobic wastewater .

Hence , from the question ,

The correct option is d.

a patient chooses to not take a beneficial medical treatment.

explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.