Final answer:
The R bacteria uptake genetic material from the dead S bacteria, which is required to make the R bacteria deadly.
Step-by-step explanation:
The R bacteria uptake some genetic material (that are required to make the R bacteria deadly) from the dead S bacteria.
In the experiments conducted by Frederick Griffith, he observed that when a combination of dead R and live S bacterial strains were injected into mice, the mice died. This was due to the transformation of genetic material from the dead S bacteria to the live R bacteria, making the R bacteria deadly. The process of transformation involved the transfer of some substance, known as the transforming principle, which led to a change in the characteristics of the R bacteria.