Editing Kingdom (biology) (section)

== Viruses ==
The [[International Committee on Taxonomy of Viruses]] uses the taxonomic rank "kingdom" in the classification of viruses (with the suffix ''-virae''); but this is beneath the top level classifications of [[Realm (virology)|realm]] and subrealm.<ref name=ictvcode >{{cite web |url=https://ictv.global/about/code |title=ICTV Code |website=talk.ictvonline.org |publisher=International Committee on Taxonomy of Viruses |access-date=26 April 2020}}</ref>

There is ongoing debate as to whether [[viruses]] can be included in the tree of life. The <!-- since no number of "in favor" given, why say 'ten' -->arguments against include the fact that they are obligate intracellular [[parasites]] that lack [[metabolism]] and are not capable of [[Self-replication|replication]] outside of a host cell.<ref name="Moreira and López-García">{{cite journal |last=Moreira |first=David |author2=Purificación López-García |title=Ten reasons to exclude viruses from the tree of life |journal=[[Nature Reviews Microbiology]] |year=2009|volume=7|pages=306–311 |issue=4 |doi=10.1038/nrmicro2108 |pmid=19270719 |s2cid=3907750}}</ref><ref name="Luketa 2012">{{cite journal |title=New views on the megaclassification of life |journal=[[Protistology]] |date=2012|first=Stefan |last=Luketa |volume=7|issue=4 |pages=218–237 |url=http://protistology.ifmo.ru/num7_4/luketa_protistology_7-4.pdf}}</ref> Another argument is that their placement in the tree would be problematic, since it is suspected that viruses have various evolutionary origins,<ref name="Moreira and López-García" /> and they have a penchant for harvesting [[nucleotide sequences]] from their hosts.