Why do the parts of the tree represent the each section of the claims, evidence and reasoning conclusion?

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls

Name the organism that belongs to the kingdom protista.

These are the components of the reservoirs of carbon that are exchanged in our environment.