I believe it is a, but I am not sure.
Sorry if I am wrong
Living things are made of cells.
living things obtain and use energy.
living things grow and develop
living things respond to their environment.
living things adapt to their environment.
I believe the answer is predator but I could be wrong
Basically Hershey and Chase studied bacteriophages (viruses that infect and destroy bacteria), which they got the idea from Avery who got the idea from Griffith.
so the results of Hershey and Chase's experiments were that genes are made from Deoxyribonucleic Acid.
hopefully this helps