The diagram shows a rock profile containing layers of different types of rock and igneous intrusions. Put all five types of rock into the correct
relative-age order of the oldest layer to the youngest layer. (Please answer
in complete sentences)
Rock Profile
Surface of Earth
Shale
Limestone
Igneous intrusion X
Igneous intrusion
Mudstone
Nour answer

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.