Which of these statements is not true with regard to the process of evolution? a. it has been observed in populations of living organisms. b. it is used to explain key similarities in organisms by all but a few scientists. c. it is a sudden change that causes species to become extinct. d. it explains the pattern of change in living organisms shown by the fossil record.

Which of the following is an accurate statement about pathogens? infection and disease are caused by pathogens living in infectious agents found in the environment. pathogens, which cause infection and disease, are the most abundant organisms in the environment. most organisms in the environment are harmless, except for pathogens, which can cause disease. the environment is rich in infectious agents that transmit disease through pathogens.