Where would you find methanogens, which can function only in the absence of oxygen? select the correct answer. a. roots of plants b. human intestines c. synthetic fertilizers

I think the correct answer from the choices listed above is option B. You can find methanogens in the human intestines. These organisms can  work with or without oxygen. Too much of oxygen for them is toxic. They are obligate anaerobes.

It's cell theory. easy name i would think.

An ecosystem is in a certain area and includes living and non living plus there is weather conditions and a biome is a large amount of area with similar climate.so ecosystem is based on weather and biome is based on the average climate