Answer:
Hand washing has external health benefits, helping prevent the spread of communicable diseases. If a program were somehow devised so that people received a small reward every time they washed their hands, we would expect the frequency of hand washing to increase.
Explanation: People who are given something (A reward of some sort) are proven to do something more, (in this case washing their hands more), or better then they would do without a source of motivation.
Hunter-gatherers were people who lived very early in times of human civilization when we didn't have any permament settlements yet, nor have we invented agriculture either.
Hunter-gatherers lived through animal hunting, foraging, and other types of resource depletion of a certain area. When they depleted all the resources (killed most of the animals, and ate most of the berries for example), they moved to another place.
False, it increases the population where people are migrating to
The parts which are connect to the cord in a napkin machine are as in ; Choice 1; Pail and Cigar lighter.
<h3>What is a self-operating napkin machine?</h3>
The self-operating napkin machine otherwise called the Rude Goldberg machine has modus operandi as follows;
Extra weight in the pail pulls cord which opens and the automatic cigar lighter is lighted, thereby setting off sky-rocket, which causes sickle to cut through the string and allow the pendulum on which the napkin is attached to swing back and forth thereby wiping off one's chin.
Read more on self-operating machine;
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