A biology class is conducting an experiment to determine how soil pH may affect the germination of pine seedlings. Three pine seeds are placed in a pot of soil with a pH of 6.5, and three pine seeds are placed in a pot of soil with a pH of 4.0. After one week, the students count the number of seeds which have germinated and determine the mass of each pine sprout. Which of these is the BEST way to improve the accuracy and validity of the data in this experiment?

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody