Avirus mutates with every infection, thus making them difficult to locate

Polymorphic. Polymorphisms refer to spasmodic genetic variation within the same species of an organism resulting in varying forms of the species. Polymorphic viruses, mutate at faster rates hence the virus population is subject to high rates of turnovers. The high divergence of various species, such as influenza, is as a result of 0.01 mutations per nucleotide site per year.   

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

explanation:

okay now i don't know this but for the pints nothing else to say bye