Answer:
They used radioactive labeling techniques to build two different types of phage.
Explanation:
In 1952, a set of experiments were carried out by American biochemists Alfred D. Hershey (1908-1997) and Martha Chase. They prepared two separate virus samples, one contained DNA labeled with a radioactive isotope and the other contained protein labeled with a different radioactive isotope. They grew the two types of viruses separately, infected bacteria with the two sets of phages and analyzed the bacteria for radioactivity. From the results obtained, Hershey and Chase concluded that the viral genetic material was DNA and not protein, reinforcing the observations previously made by Avery.
The correct answer should be A, multicellular.
a fish simply moves its tail and its fins to swim. They move their caudal fins (tail fins) to propel themselves through the water. Their pectoral fins, and for the most part, the rest of the fins, are used to help the fish change direction, along with the pectoral fins helping them to stop.
B because that is what happens if u have a reaction to something and stuff like that