The chemical equation below shows what happens when propane reacts with oxygen to form carbon dioxide and water. c3h8 + 5o2 → 3co2 + 4h2o which component of the reaction is composed of an element and not a compound? group of answer choices

a. o2

b. c3h8

c. co2

d. h2o

Which label correctly identifies what x represents in the concept map?

What is the most common structure of volcanoes?

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