Describe what happens during nuclear fusion in a main sequence star (like our sun). Hydrogen atoms (with 1 proton) combine with other hydrogen atoms under
extreme heat to produce helium (2 protons) and a large amount of energy.
Helium atoms (with 2 protons) combine with other helium atoms under extreme
heat to produce hydrogen (with 1 proton) and a large amount of energy.
Hydrogen atoms (with 1 proton) move around the sun at nearly the speed of
light creating pressure in the sun while gravity pushes them closer together.
Helium atoms (with 2 protons) move around the sun at nearly the speed of light
creating pressure in the sun while gravity pushes them closer together.

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