Which of the following accurately describes nutrient limitation?
a. if one essential nutrient within an ecosystem runs out, primary productivity will be limited.
b. limiting nutrients are the nutrients whose supply is in excess.
c. nitrogen is typically the limiting nutrient in freshwater environments.
d. soil environments aren't affected by nutrient limitation.
the answer isn't c got it wrong on the test

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