Papillary structures composed of tumor cells arranged radially around a

a- all cells come from pre-existing cells

airlines i think? or a cruise boat? does this work out for u? ?

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.