The second punch of the immune system's one-two punch known as ____ (refers to the body's non-cellular fluid) is mediated by antibodies and has greater target precision but less speed. a. viscous immunity c. humoral immunity b. cell-mediated immunity d. cambiatic immunity

A __________ reinforcer satisfies a basic survival need, like hunger or thirst

a. primary b. physiological c. positive d. secondary

Darwin believed that emotional expressions began as ________ that came to have evolutionary value because they ________

a. physiological reactions; convey emotional states to other members of the species b. physiological reactions; increased the efficiency of bodily reactions c. communication devices; increased the efficiency of bodily reactions d. random mutations; convey expectations to other members of the species