What is happening to the birth rate and age structure of that population when population growth increases in an area?
a. increasing birth rate with a greater number of young organisms
b. increasing birth rate with a smaller number of old organisms
c. increasing birth rate with a smaller number of young organisms
d. increasing birth rate with a greater number of old organisms

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.