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.
I think 1) B I don't know what 2 is but it isn't A or B it is between C or D
Answer:
Explanation:
divergent
seafloor spreading
heat
lava
The answer would be true because shes the one who carries the gene and hes normal but the child has a chromosome from each parent