Best we know, endospore formation in bacteria is limited to the phylum Firmicutes. Why haven't others evolved to use this wonderful survival device? How would you teach a non-spore forming bacterium to make spores?
by Nicole Flanagan — Is there any human-associated bacterial species that cannot cause disease if introduced into some site of the body?
Have you ever heard of an RNA virus that is capable of a lysogenic existence, either as an episome or by integration into the host genomes? Retroviruses excluded.
Do you know of any eukaryotic virus that has a tail, and, if not, why do you suppose there aren't any?
Can you conceive of an entity that can replicate as a cell under some circumstances or as a virus under others?
Why do you suppose there are few, if any, mycorrhizae in aquatic environments?
