Which of the following are essential factors that need to be considered to decide when and how much a cultivated field needs to be irrigated? P. the crop to be sowed.
Q. the number of weeds in the field.
R. the nature of the soil S. the average amount of rainfall the region receives.
T. the type of tractors used in the field.
1 only P, R and S
2 only P. Q and R
3 only P. Q and S
4 All - P. Q. R, S and

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