which classification level is broader than the kingdom level; which branch of biology is concerned with the naming and classifying of organisms?; why is diverse a good word to use to describe protists; which group of organisms includes only multicellular heterotrophs; two organisms that are classified in the same class must also be classified in the same:; the gradual change in species over time is called; which classification level is broader (less specific) than the phylum level?; what is taxonomy?