What did stanley miller's experiment in 1953 illustrate regarding the origins of life? a. it produced the chemicals of life by simulating earth's early conditions. b. it created spontaneous generation, which showed the earth's age. c. it produced the chemicals of life by simulating earth's modern conditions. d. it produced radiometric dating, which showed the earth's age.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

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

Adistinctive characteristic of mammals that is not observed in other vertebrates is