What organisms were most likely to live at the same time as brachiopods

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

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.