Question

what is retrovirus and by which material it made of?

Answer 1

any of a group of RNA viruses which insert a DNA copy of their genome into the host cell in order to replicate, e.g. HIV.
It is made up of RNA

Answer 2

any of a group of RNA viruses which insert a DNA copy of their genome into the host cell in order to replicate, e.g. HIV. it is made up of RNA.