You are studying the effect of fertilizer on the yield of tomatoes. In order to do this, you use the same type of tomato seedlings, make sure they get the same amount of water, and are exposed to the same amount of sunlight. What type of experimental variable is the yield of tomatoes? a) dependent variable b) independent variable c) controlled variable d) none of the above

What are the pros and cons of transect sampling?

The term facultative anaerobe refers to an organism that

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