Describe the effects of decreasing the concentration of magnesium salt on the growth of S. polyrhiza.

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Which of the following lines of evidence would best support your assertion that a particular plant is an angiosperm? a) it produces seeds. b) it retains its fertilized egg within its archaegonium. c) it lacks gametangia. d) it undergoes alternation of generations.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?