Is this statement true or false? all body systems maintain the constant internal environment of the body. a. true b. false2. (1 pt)organisms reproduce by two main methods. one is division, where the animal divides and creates an exact copy of itself. what is the other main method of reproduction? a. combination b. fusion c. division d. fission3. (4 pt)which sentences describe functions of the immune system? choose all answers that are correct. a. bones produce extra white blood cells to increase its defense against germs. b. the body filters the blood for waste materials. c. cell membrane keeps germs from entering the cell. d. lymphocytes create antibodies that attach to the germ.