The first vaccination was developed by a) using a culture of typhus to cure scurvy b) using a culture of cowpox to prevent smallpox c) using an elixir of fruit juice to prevent typhus d) using sheep's blood to prevent illness

Drug that change your sense of and make you see and hear thing that are not real

An is a record that contains a list of qualified workers in an industry.

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.