3. which of the following researchers used radioac-
tive markers in experiments to show that dna was
the genetic material in cells?
a. frederick griffith
b. oswald avery
c. alfred hershey and martha chase
d. james watson and francis crick

i have to report this, it doesn't relate to biology

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )