#3 is Martin Luther King Jr. and Robert F. Kennedy. As a result, they left the nation in political turmoil.
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.
Answer: I dont know but I think it is a dumb qustion that they asked that
Explanation:
Answer: They do this through a process called "mutation".
It could also be genetic modification, depends on what your text or teacher teaches you tbh.