In his theory, lamarck suggested that organisms will develop and pass on to offspring variations that they need in order to survive in a particular environment. in a later theory, darwin proposed that changing environmental conditions favor certain variations that promote the survival of organisms. which statement is best illustrated by this information? (a) scientific theories that have been changed are the only ones supported by scientists. (b) all scientific theories are subject to change and improvement. (c) most scientific theories are the outcome of a single hypothesis. (d) scientific theories are not subject to change.

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