Which of the following would have the least impact on primary productivity in the euphotic zone? A. The release of nutrients from bacterial decomposers
B. The emissions of hydrogen sulfate along hydrothermal vents
C. The availability limiting nutrients
D. The Availability of sunlight

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.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen