I have an atomic mass of 20 and I’m a gas what am i?

According to the cladogram, which organisms have roundworms as a common ancestor?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Actinobacteria sp. are fermenting organisms (which do you use oxygen to breathe) referred to as chemoorganohetereotrophs this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe