Virus are made with ADN or RNA only, which both of them has the information of replication. Once that the virus is in a cell, this ADN or RNA will be deposit inside the cell at the replication system that is going to make the virus reproduce unlimited times until the membranes of the cell break down. And they are useful because you can use them as a carrier or vector for treat diseases or for transgenics, bioterrorism, and so on.
Answer:
a,the ability to go from a single cell to multicellular organism
All you would have to do is sum them up cause their going the same direction.
I believe CODIS still exist because if there is anything new about DNA in a laboratory, it will go straight to CODIS>
