Dust, sweat, and other secretions encourage germs to _____.

The correct answer is that dust, sweat, and other secretions encourage germs to multiply. This is because these substances provide a suitable environment for germs, such as bacteria and viruses, to thrive. Dust can carry various pathogens, while sweat can provide moisture and nutrients that facilitate the growth of microorganisms. As these secretions accumulate, they create an ideal breeding ground for germs, leading to their rapid reproduction.

In contrast, the other choices do not accurately describe the effect of these substances on germs. For example, lessening implies a reduction, which is not the case as they actually support microbial growth. Dissipate suggests that germs would disperse or diminish, which contradicts the biological response of pathogens to a favorable environment. Evaporate indicates a phase change related to moisture, which does not reflect the nature of microbial behavior in the presence of supportive substrates like sweat and dust. Overall, the interaction of these secretions with germs typically leads to an increase in their numbers, not a decrease.