Which of the following explains how cells become specialized to develop into parts of organ systems? Select one:

Cells develop in particular areas of the body, which gives them the same functions.

Cells undergo differentiation during their development, which activates particular genes.

Cells perform chemical reactions that change their physiology, which allows them to become organs.

Cells join together with others that have the same function, which produces organs.

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