Why are some groupings/classifications of organisms considered to be hypotheses? (Pls need help ASAP)

What are the result of when individual components in an organism interact with others to create noval stucture and function called

An organism has the following traits multicellular cant photosynthesize has a skull. wht kingdom does this organism most likely belong too?

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.