Although America fought in many wars since, World War 2 was the last time the nation declared war (actually against two nations at the time). One declaration of war with Japan, and one declaration of war with Germany. I hope this helped !!
The concept was that DNA is what causes bacterial transformation. Before, people thought the genetic material of bacteria was carried through proteins.
I am very sure the answer is B plz give me thanks and brainliest if u can
